500W vs. 750W E-Bike: Does wattage matter on hills. 750w electric bike motor

E-Bike Motor Wattage: 350W, 500W, And 750W

What does wattage mean for your e-bike? What type of motor wattage should you choose based on the way you ride? And how do you know how much wattage your motor can deliver? We’ll answer all this and more!

What Is Peak Motor Power Vs. Nominal Output?

When shopping for e-bikes, you may notice 2 unique values for your motor’s wattage. For example, you may see “Nominal” at 500W but “Peak” at 750W. So how do you know what the wattage of your e-bike’s motor really is?

Peak output is how much power the motor can produce for a short period of time. When you rev your throttle up to full blast or engage your highest level of pedal assist up a steep hill, your motor is engaging peak output to give you the most possible assistance for that quick burst.

It’s common for peak output to be about 250W higher than your motor’s nominal output, and that’s the case for nearly all of our Magnum Bikes.

Nominal output is your main consideration when you look at motor wattage. It’s the amount of power your motor normally delivers, and it can provide this amount of power consistently without causing damage. And if you can only find one number listed for your e-bike’s wattage, it’s most likely the nominal output.

Curious how much wattage you’re using while you ride? Look on the righthand side of your Magnum display.

How Many Watts Do E-Bike Motors Have?

Depending on the manufacturer and model, you can find e-bikes come with motor sizes ranging from 250W up to 1000W and beyond.

That said, it’s important to note that e-bikes with nominal wattage above 750W aren’t considered e-bikes by most states and regions. Instead, they’re typically considered to be motor vehicles or mopeds. This means they can only be ridden where cars and other motor vehicles are permitted.

So, how do you decide how much wattage you need?

Is A 500W Motor Enough For An E-Bike? What About 750W?

A number of factors influence the speed and power generated by your e-bike’s motor, including the e-bike’s weight, quality of the motor, and torque. Once you take those factors into consideration, the right motor size for you depends on where and how you most commonly ride.

Steep Hills, Challenging Terrain, Or High Usage Of Pedal Assist And Throttle

For riders who love to tackle steep hills and long rides, a more powerful motor can provide more assistance. The same applies to riders who frequently use the throttle and/or the highest levels of pedal assistance on their e-bike.

When shopping for an electric bike, these riders may be most interested in features like motor size, battery size, and range, and may lean toward a geared hub e-bike with at least a 500W or 750W motor.

Flat Roads, Casual Rides, Or Low To Moderate Usage Of Pedal Assist And Throttle

For riders who prefer to use their own strength and power as much as possible, only tapping into the e-bike’s pedal assistance and/or throttle when the going gets really tough, motor size may not matter as much.

When these riders shop for e-bikes, comfort, style, and bike weight may be more important to them than motor size, so they may consider either direct drive or geared hub e-bikes with 350W motors in addition to the more standard 500W.

Wattage can be a major factor when shopping for your electric bike, especially if you love to ride on challenging terrain. Pictured: Peak Series.

Magnum E-Bikes By Motor Size

Most Magnum Bikes have 500W motors, but there are exceptions! Find your perfect ride below.

Magnum Bikes With 350W Motors

In our current collection, the only Magnum Bike with a 350W motor is the Pathfinder 350. This Fat Tire e-bike has a low-step frame and is a great choice for paved trails and relaxing rides.

The Magnum Pathfinder 350 powers a fun ride on a sunny day.

Magnum Bikes With 500W Motors

Most Magnum Bikes feature 500W motors.

In addition, many of the models in our Metro and Pathfinder series feature 500W motors; exceptions within those series can be found in the 350W or 750W sections of this article.

The Premium 3 Low Step represents one of many 500W models available from Magnum Bikes.

Magnum Bikes With 750W Motors

Metro 750. Nomad. Peak T7. Ranger 1.0. Ranger 2.0. and Scout all feature powerful 750W motors built for any way you like to ride.

From bike lanes to trails, 750W e-bikes like the Magnum Scout can take you anywhere.

Take Our Quiz To Find Your Perfect Match

Wondering which e-bike is the best for who you are and the way you ride? We get it!

There’s a lot more to picking out the right e-bike than the motor size alone.

Take our Help Me Choose quiz to see our suggestions for your perfect match.

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Team Magnum

0W vs. 750W E-Bike: Does wattage matter on hills?

5 Комментарии и мнения владельцев

Does size matter? It’s a query as old as time that, depending on who you ask and in what situation, is going to yield a broad and potentially colorful range of answers.

In the less colorful context of electric bikes, motor size (to most people) very much does seem to matter. The general consensus is that bigger is better. watts equals more power; equals more speed; equals an easier time climbing hills. But is bigger always better, or can a carefully tuned smaller motor compete with sheer wattage?

500w, 750w, e-bike, does

We set out to explore this question with a simple test: A head-to-head uphill race between a powerful 750W rear hub motor e-bike and a 500W rear hub motor e-bike that the brand claimed had been specifically tuned for hill climbing.

The result of that test was about as we expected, with the more powerful bike winning our race, but the relationship between motor size and climbing ability is far more complicated than power alone.

The test: How we did it and why

In the wake of Electric Bike Report’s September, 2021 review of the Tower Beach Bum 2, the brand reached out to us noting that their bike, which uses a 500W rear hub motor, had gone just as fast or faster up our test hill than some 750W e-bikes we’ve reviewed.

The 500W Tower Beach Bum 2 has a motor specially tuned for climbing, according to Tower’s founder.

Better yet, the brand’s founder, Stephan Aarstol, pointed out in an email, the Beach Bum electric cruiser bike had climbed faster than several Class 3 750W e-bikes, while the 500W Tower was limited to Class 2 speeds. In fact, he said, the Beach Bum was near the top of our hill test all-time leaderboard (at that time).

Aarstol wondered if we unlocked the Beach Bum to Class 3 speeds, if it wouldn’t be one of the quickest climbing bikes on our test hill. His bike, he explained, had a motor that is specifically tuned to climb hills quickly.

So, to test Aarstol’s claim and attempt to answer the question of if bigger is better, we devised a plan to pit the Beach Bum against a similar but higher wattage e-bike.

The Blix Sol Eclipse uses a 750W rear hub motor and was an exceptionally good performer up our test hill when we reviewed the bike in 2021.

The location would remain the same; we’d use our test hill, Hell Hole, a one-third of a mile long section of bike path with an average gradient of 12 percent. To keep the playing field relatively level, we chose the Blix Sol Eclipse electric cruiser bike as the more powerful challenger. That bike is similarly priced, similarly spec’d and of similar style to the Tower, but uses a more powerful 750W rear hub motor. It’s also an electric cruiser that put down an exceptional time on our test hill when we reviewed it last year.

Like in our standard review process, we’d conduct two timed laps up Hell Hole on each bike. One lap using just the throttle and the other using PAS 5.

The results: Blix beats Tower, higher watts prevail

Alas, for those rooting for the underdog, Goliath has prevailed and, at least in this limited test, added evidence to the argument that size does indeed matter (at least when it comes to e-bike motors).

In the PAS 5 test, the 750W Blix Sol Eclipse bested the 500W Tower Beach Bum 2 by a margin of 10 seconds with a time of 1:01.00 compared to the Tower’s 1:11.00. Ten seconds may not seem like a large difference, but in a distance of one-third of a mile just a few seconds can equate to a sizable difference in speed. The Blix, for example, held an average speed during the PAS 5 test of 17.8 mph while the Tower had an average speed of 15.3 mph.

The Blix proved to be the best climber of the two.

Despite upping the Beach Bum 2 to Class 3 speeds, it doesn’t appear to compete with the more powerful 750W e-bikes.

We saw similar results in the throttle only test, with the Blix beating the Tower with a time of 1:19.00 to 1:35.00, but this is about what we expected as the Beach Bum’s change in speed setting only affects pedal assist and not throttle performance.

At least in this test, the more powerful 750W Blix was the best performer despite the Tower’s carefully tuned motor and higher pedal assist speed. You go, little rockstar.

Some context: Why power isn’t always everything

In this instance power has reigned king, but this test is far from the end-all be-all. In fact, there are far more factors at play than just motor size when it comes to determining an e-bike’s uphill ability.

Arguably the largest factor is weight, and how much of it a motor of any size is having to push uphill. Rider weight is probably the largest variable, and obviously heavier e-bikes will likely need more power to climb as quickly as lighter e-bikes.

You also have to consider the type of motor. In this test, we did a head-to-head comparison of two geared rear hub motors of different wattages. If we redid this test to include a mid-drive motor, it’s likely the mid-drive powered bike would require far fewer watts to go as fast or faster than either the Blix or the Tower.

The 750W mid-drive motor on a QuietKat Jeep full suspension electric fat bike. The Jeep is among the most powerful e-bikes we’ve ridden and reviewed.

Mid-drive motors make more power out of less wattage by leveraging the bike’s drivetrain, meaning the bike’s performance, torque and speed will change depending on which gear you choose. Whereas a rear hub motor is a direct-drive system that applies power directly to the wheel.

Finally torque is a factor that must be considered, especially when talking about uphill performance. torque typically equates to better climbing, so it’s entirely possible that an extremely torquey 500W motor may beat out a more typically tuned 750W motor — it just depends on the bike and rider.

I could write a whole post dedicated to the factors that dictate climbing performance, so know I’m glossing over them here. But in this case, with these two bikes, on this specific hill and with me as the rider, the more powerful e-bike came out on top.

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Aurora Limited

Aurora Limited offers one of our most classic, best-selling designs with all of the top-of-the-class components for maximizing your riding experience. Bringing together a unique step-through style, fully automatic shifting system. Enviolo Automatiq, maintenance-free Gates Carbon Belt Drive, comfortable upright sitting position and plush oversized tires to smooth out any bumps. you’ll find the Aurora Limited to be a stylish, reliable bike that you’ll use for years to come. Perfect for men and women, beginner or seasoned riders. we invite you to join the thousands of riders who have already discovered the Aurora Limited.

Why People Love the Aurora Limited

Powerful Mid-Drive Motor

Unparalled performance that only a mid-drive motor can offer you combined with a throttle-on-demand so you can pedal as much or as little as you wish.

Maintenance-Free Belt Drive

Forget loud and greasy chains. The Gates CDX Belt Drive requires no lubrication, maintenance, or adjustments. Pure joy of riding with none of the hassles.

Fully Automatic Shifting

Treat yourself and experience Enviolo Automatiq. a fully automatic transmission. that will shift the gears for you, so you can set it and forget it.

All The Features

The Aurora has been part of the EVELO Lineup for over 10 years, in a variety of configurations, and the Limited includes every available option we’ve ever offered.

EVELO offers easy assembly options, top rated customer support, and the strongest warranty in the industry.

Easy Access Step Through Frame

Removing the top tube from a high power electric bicycle is no easy task, but EVELO engineers have designed the Aurora to offer the lowest point of entry possible, making it easy to get on and off the bike for both men and women.


The step through frame also benefits touring cyclists, making it easy to get on and off your bicycle with a full load of gear on the rear rack. This is the future of eBikes.

Enviolo Automatiq Shifting

The Aurora Limited features the Enviolo Automatiq CVT system, which offers fully automatic shifting in any riding conditions. This is the best eBike drivetrain available worldwide, and offers the easiest and most reliable eBike shifting possible.


We keep the battery on the rear rack to make access as easy as possible. The Galaxy Lux features the lowest step through height of any EVELO model.

High Power, Long Range

Go the extra mile with EVELO’s top-tier Li-ion cell technology. Our large semi-integrated frame battery offers extended range, and is easily removed for charging on or off your bicycle.

500w, 750w, e-bike, does


With short charge times and up to 60 miles of range for your average rider, you can ride and explore more and spend less time worrying about when to head back home.

Mid Drive Motor Gates Belt Drive

As a rider, you have full control over motor assistance while you ride, for as much or as little additional power as you need, when you need it.

The Gates CDX Belt Drive is smooth, clean, and requires no maintenance.


Torque Sensing motors offer the most natural riding experience possible. The motor senses rider input while pedaling, and calculates the perfect amount of assistance to help you along: whether you’re conquering a steep hill, or riding comfortably on flat ground.

A belt drive means no more risk of a greasy mess on your pant leg from a chain. The belt and gears require no lubrication whatsoever, and no maintenance. which means you can just FOCUS on your ride. The belt drive system weighs in at about half the weight of a traditional chain. With the Gates Carbon Drive you will enjoy a quiet and ultra-smooth riding experience everywhere you go.

Handlebar Throttle, Fenders, Lights

The Aurora Limited comes with a throttle on the handlebar, giving you power-on-demand anytime you need it. We also include full length fenders and integrated lighting right out of the box.


Our thumb throttle makes it easy to just push your finger to give you the extra power you need to motor up the hill, or accelerate from a stop.

It’s gives you peace of mind that you can use the throttle to get home if you’re ever too tired.

The Aurora Limited also comes with full fenders making them perfect for blocking the mud, water, and grime that you encounter while out riding.

The best part is the fenders are already installed. You don’t need to buy them separately or even have to install them yourself.

Looking for Reviews?

Evelo Aurora Limited pedals better than an 8,000 German e-bike.

Evelo has cracked the code to smooth, effortless pedaling. It’s added a host of creature comforts that make this bike only a couple steps away from being the most comfortable bike in the known universe.

Easy Assembly

The Aurora Limited arrives almost fully assembled (95%), so you can be riding in no time. We offer instructional videos, instructions, along with an option for professional local assembly if turning a screwdriver isn’t for you.

Local Shop Assembly

From your local bike shop

Find The Perfect Electric BikeIn less than 3-Minutes

Answer a few quick questions and we’ll instantly recommend the best eBike for you. Get custom recommendations based on your height and riding needs.

Save on our Comfort Package

A wider saddle, suspension seatpost, and front suspension stem are the most popular upgrades with EVELO riders.

This package offers the smoothest ride possible, adding even more cushion to the seat, an additional light bar for safety, and both front and rear suspension for Cloud-like pedaling. Save over 20% when bundled with a new order.

Open Box Bikes

If you’re looking for an even better deal and are comfortable with a bike that has a few miles on it, take a look at our Open Box Bike inventory.

Product Specifications

Components Weight

Powerful Dapu 750W (1,000W peak) Mid-Drive Motor w/ 105N.m. Torque.

48V 14.5Ah Battery with Advanced Battery Management Software

Maximum Motor-Assisted Speed

20 Miles per Hour (Can be Increased to 25 mph Maximum in Off-road Mode)

Up to 60 Miles on Pedal-Assist or 25 Miles on Electric-Only

Multiple Levels, Plus Electric-Only (via Throttle)

6061 High-Strength Aluminum Alloy

Suntour XCM32 Boost Technology 15mm Thru Axle, with fender eyelets

36H 45mm wide Double Wall Alloy Rims with 13g Spokes

Puncture Resistant Innova 26 x 2.8″

Zoom Hydraulic Disc Brakes with 180mm Front 160mm Rear Rotors and Cutoff Switch

Velo Breeze Comfort Saddle with Memory Foam

Enviolo Continuously Variable Transmission

Enviolo Automatiq Controller

Fully Integrated Spanninga Kendo Front, Lineo Rear

EVELO C800 IPS Multi-Color 3.7″ Display

Integrated Cargo Rack, 45 lb. Weight Capacity

Bicycle Weight (without battery)

Battery Weight

Maximum Rider Weight

Recommended for riders up to 250 lbs. Larger riders are best on the Omega or Atlas.

EVELO Water Bottle Bottle Holder Included.


Recommended Rider Heights

Seat Height (Minimum / Maximum)

Seat to Pedal (Lowest / Highest)

Reach (Saddle to Handlebar)

Total Length (Tire to Tire)

Wheelbase (Center to Center)


An upright riding position puts the rider in a nearly vertical seating position for the most comfortable ride possible. You will experience little weight on hands and wrists, with the handlebars within easy reach. No stress or strain on the lower back, hands, or wrists.


Is the Aurora Limited a good choice for me?

The Aurora Limited is a feature packed bicycle, with an easy access step-through, and comfortable riding position. This bike is perfect for primarily road riding, some trail riding, and can tackle even the steepest hills and toughest climbs across the country. The mid drive motor system uses a torque sensor, which offers a smooth and natural feeling, but does require minimal pedal pressure to get going.

Does the Aurora Limited have enough power for my terrain?

Mid Drive eBikes are the top of the line as far as power is concerned, and a 750 Watt Mid Drive bike will produce more power and torque than a 750 Watt Hub Motor bicycle. The Aurora Limited can handle larger riders with ease, and can comfortably climb 10% grade with no pedaling whatsoever. The powerful Mid Drive motor, combined with the Enviolo Harmony Automatic shifting system operates at the highest efficiency possible, offering the most power, and range in its class.

Will I fit properly on the Aurora Limited?

The Aurora Limited can be adjusted to suit Medium and Larger sized riders. Take a closer look at our sizing chart and specifications on the product page. A great way to compare this to your existing bike is to measure your current saddle height straight down to the ground. this gives you a real number to compare to the specs on our website. If this measurement is over 32”. you’ll fit well on the Aurora Limited.

Questions about the Aurora Limited?

Schedule a Free Consultation with an EVELO eBike expert. We’re happy to offer 1 on 1 service to answer any of your questions about the EVELO Aurora, or any other eBike related topics.

Customer Reviews

I now have two Aurora Limited e-bikes from EVELO. One for San Francisco and the older one in Tucson. Great components and wonderful customer support made me buy the same bike 4 years later (of course there were a few upgrades over the years). The new Enviolo Automatic is the main difference although the grips and fender connections have also improved. Face it the components are excellent. I love the fork along with the Cloud 9 seat provides all I need for comfort in pothole ridden streets. I added the following accessories: Cloud 9 Seat, EVELO Bell, Front and rear lights that are bright and blink, a left and right mirror and the EVELO rack pack.

I highly recommend the bike and EVELO because of components and excellent customer support. Mel Mashman. San Francisco

Good ebike with nice features

I have only had a few opportunities to ride my new Evelo bike. The weather has not been very conducive for this 81 year old to go for a decent ride, however, the few times I have ridden the bike has certainly been a nice experience. I tried a difficult hill the first time out and it went up without any trouble. I was a little winded but not near as much as I would have been on my GenZ. I am very impressed with the Envielo Automatiq transmission. It performs as advertised. The weather is improving daily so I will soon be able to get in some nice long rides. John A. George

I put my Aurora Limited through its paces every ride as I’m in the mountains on a dirt road. Every component is tough and top notch! I had a question about getting beefier brakes and I got my answer with all the information I needed in about 12 hours!

Great bike. Great customer service.

© copyright 2023 EVELO. All rights reserved

Engwe Engine Pro 750W review

Engwe’s Engine Pro electric bike certainly looks very different from your average folding electric bike.

It’s quite frankly gigantic, with the 20in wheels wrapped in 4in-wide studded off-road tyres that look as if they belong on a motorbike. The Engwe has a certain ‘monster truck’ appeal to it. It’s one seriously heavy bike too. At 34kg with all the accessories in place, the idea of this being a portable folding bike is somewhat fanciful.

However, I appreciate being able to reduce the bike’s footprint from its 114cm wheelbase (174cm end to end) to half that for storage.

Engwe Engine Pro 750W motor and battery

The Engwe’s engine has impressive figures; the rear-hub motor is rated to 750w and the frame houses a 48v 16ah/768Wh battery. Engwe claims this makes the bike good for 120km / 74miles, which is somewhat generous. If you used the bike in ECO mode and never above level one, maybe you’d hit that range. However, you wouldn’t be having much fun doing it. The Engwe’s engine does impress, as does the way it’s controlled. The full-colour HD screen is bright and easy to read, and the five-button bar-mounted remote gives easy access to the system’s functions. With three power modes – ECO, Normal and Sport – and five levels in each of those, the bike has plenty of options for power assistance. In ECO, the bike is a sedate ride, the steering is quick and the upright riding position makes it a comfortable place to be. Push up through the modes into Sport and the higher levels, and the 750w motor really shows its true metal.

The full-colour screen is easy to read and controlled by a bar-mounted remote. Russell Burton / Our Media

The Engwe has ridiculous amounts of pure grunt, to the point where the pedal assistance can hardly keep pace with the motor input. Occasionally, it can feel as if the bike is running away from you. A dab of the brakes disengages the motor, but it’s a bike you need to get accustomed to. It also has a throttle assist trigger, which comes in handy when pulling away from the lights or helping you get up an incline on what is one seriously weighty machine. If you hold the throttle in the open position, the bike has a built-in cruise control that maintains the power irrespective of pedal input (though still requiring it). It’s not quite a full-on throttle operation, but it’s something of a grey area. Perhaps the motor system’s neatest trick is you can drop it down to level 0 in ECO mode and use your pedal power to top up the battery. It’s not the easiest bike to pedal under your own steam however, and the mass and those chunky tyres don’t exactly scream efficiency. I tended to only use this feature when riding downhill. You shouldn’t expect to fully recharge the reserves, but on longer descents I did manage to eke out between 5 and 9 per cent battery according to the display.

Engwe Engine Pro 750W spec details

The bike is somewhat over-built. The massive balloon tyres are all the suspension you could ever need, so the 61mm-travel suspension fork feels like overkill. For the most part, I’ve left the fork lockout closed. At the rear, a four-bar linkage back end with a non-adjustable rear shock is superfluous to the bike’s needs. Removing the hefty fork, and simplifying and lightening the rear end, would make sure the bike makes more of its powerful motor and battery package.

The brakes, with their 180mm rotors, stop the bike quickly and safely, and the Shimano gears are efficient but not exactly slick. There’s a bit of chain chatter at each end of the gear range, but they’ve kept working well come rain or shine and on all surfaces. The oversized rear rack is more of a platform to strap things to, because the large-diameter tubing isn’t compatible with any pannier bags I’ve tried. On Engwe’s cheaper EP-2 Pro, you get a standard-gauge rack that is.

The tubing on the oversized rack didn’t work with any of the pannier bags tried in testing. Russell Burton / Our Media

While out of the box the bike is EU-compliant and speed limited to EU regulations, you can easily change this in the settings. With a few buttons presses, the speed limit can be raised to more than double what’s legally allowed on UK roads. That’s fine if you want to ride the bike on private land, but not on public roads.

Engwe Engine Pro 750W ride impressions

Concerns aside, I’ve enjoyed the Engwe. Its big tyres and big power make for a fun ride around town and beyond. It’s got enough range, and I’ve managed between 35 miles / 56.5km and 50 miles / 80.5km in between charges (depending on the terrain and topography). It’s fun to ride off-road because those huge tyres can handle anything you throw at them and deliver grip for days. You can lean over into corners with the shoulders’ studded tread biting into dirt well. The steering can be jolted, however, because that massive front tyre can compress and bounce left or right off ridges, rocks and ruts. You need your wits about you if you venture off-road, as I did quite a lot. It does have some niggles, though. The seatpost saddle rail clamp vibrates loose frequently and the rear guard does the same.

The charger is also slow, taking the best part of seven hours to recharge from empty, and its in-built fan is noisy too.

Engwe Engine Pro 750W bottom line

Overall, I think the Engwe has a heap of potential. The motor, battery and control system are all impressive – especially at this price.

If Engwe stripped the Engine Pro of its rear suspension and superfluous suspension fork, it’d shave a whole heap of weight and make the bike far more user-friendly. It would be easier to maintain, and it wouldn’t lose an ounce of the fun it delivers.

Polarna M4 (G205) Foldable Electric Bike


Speed Demon

One of my friends recently bought the Polarna M4 Foldable Electric Bike that came with a very powerful, 750W motor, 8-speed gear shifter, and 20″ fat tires. I took it for a test ride and over the span of two blocks in my neighborhood, it went from 0 to 30mph without breaking a sweat! It was both exhilarating and nerve-wrecking to go that fast. Mind you, federal, California State, and local city laws all limit electric bicycles to 20mph! Compared to the excellent Jasion EB7 I reviewed half a year ago, the Polarna was a MONSTER! Here is my review of the M4 model after taking it for a spin for a day.

Key Lock, LCD, USB Charging Port

Why An eBike?

Electric bicycles have enabled our family to travel longer distances and visit more places even though many riders still shun them. They feel that motor assistance is cheating and I agree! Biking is as much a sport as it is recreational: on one hand, there are those who want to challenge their physical abilities, and on the other, it is a more leisure way to explore and bond with family and friends. Two children have steered the competitive me towards the latter as seeing the joy on their faces has even trumped the thrill I used to seek on the mountain trails. Towing them in our Burley D’Lite 2-Seat Trailer (with 45-100 lbs extra) was no joke: cramping up during a trip made for a PAINFUL ride home! That was when I really started to appreciate electric bikes — the motorized assistance on the uphill climbs and during the final return miles with tired legs had been a welcome blessing!

Googo SY26 with Burley D’Lite (25 Mi)

Bike or Scooter?

Electric scooters are more nimble to move around with — and in some cases, more fun — but local laws may prevent them from going onto the same paths as electric bicycles. Most can also be carried around more easily due to their more compact size and lighter weight. Personally, I prefer bikes because they are safer to operate, can (usually) go onto the same places that mechanical bicycles can operate, are (generally) allowed to carry an additional passenger, and if the battery runs out or fails, you can still pedal around. A scooter would stop to function without a battery.


Polarna’s 20″ Foldable Electric Bike (M4) came in the most well-protected packaging I had ever seen for a bicycle. Jasion EB7’s was done well, but Polarna took it to a whole new level. It was obvious from that moment on that the company meant business and took quality seriously. Indeed, it did. There were no scratched components, everything was already pre-assembled and tuned, and all I had to do was attach the two pedals, and the bike was ready to go! I did not even have to fine tune the disc brakes! The bike’s 68 lbs made it THE HEAVIEST electric bicycles I had ever tested, but there was a reason for that: largest battery I had seen yet, VERY strong motor, and quality material.

Assembly, as I previously shared, was simple: attach the two, collapsible pedals and done. Well, it was not that simple. Neither was marked “Left” or “Right” so you would know which crankset to screw onto. No, the manual had you look at the threading on the pedal to figure out which was which. That was a first for me, but after a few tries, both screwed right on.

Ride performance was clean, smooth, and very comfortable.

Ride performance was clean, smooth, and very comfortable thanks to its fat tires and front AND rear suspension to smooth out bumps and rocky terrain. Shock absorption level could be adjusted for the front fork for increased pedaling efficiency. Fat tires (with low tire pressure) perform better on snow and sand than road or mountain ones by not sinking as much. Furthermore, the motor’s 750W of (nominal) power was strong, holding an unfair speed advantage over both my Googo SY26 and dad’s Metakoo Cybertrack 100 mountain eBikes. Not even the excellent Jasion EB7 could not hold a candle. That meant a very sudden, Rapid speed increase that could feel out of control at times — so much so, that just slowly pedaling on Power Assist (PAS) Level 1 was enough to propel me to 15mph! Let that sink in… FIRST of five gears!

Height-wise, my friend at 5’1″ height was comfortably seated on the lowest seat position, but the handlebar could not be lowered. She looked like a motorcycle gangster on a Harley-Davidson cruising in style! Mounting and dismounting was easy for her, and she also had commented how comfortably the bike rode. I fully agreed with her.

Shifting between the 8 gears was effortless with a thumb and finger control mechanism, and the fat tires gave a very satisfying sound while zipping around the neighborhood park and up a few climbs on local mountain trails. Power Assist (PAS) was available in 5 levels by default, and speed topped at a FAST 39.4mph (63.4 km/h) without a rider. YES, nearly 40mph! With myself on it, I was able to get to 33mph. Legally, electric bikes cannot go faster than 20 mph to fall under the United States Class 2 designation, and in California, only Class 2 can ride on Class 1 bike paths. What does that mean? This bicycle’s motor was too fast to legally operate in California. Be sure to check with your local and State laws before you push the Polarna to its top speed.

The fat 4″ tires and strong 750W motor conquered our local, offroad hills with ease, gliding over cracks and sailing over gravel, sand, and rocks. It was quite fun to zip around both uphill and downhill.

Fat tires, when deflated to a low pressure, perform better on snow and sand than road or mountain ones because they do not sink as much.

Electronic controls found on the left side of the handlebar were easy to use and managed the headlight, horn, PAS level, power, and color display. The screen was easily readable under direct sunlight and provided a nice set of information, including battery and Power Assist levels, speed (current, average, max) in mph or km/h, trip time and odometer, and more. A covered USB cable port below the LCD allowed a mobile device to be charged, such as a phone used for map navigation.

The Polarna, like the Jasion, had a very clean, streamlined look with cables tucked away nicely. That bike screamed toughness with authority!

Powered by a 672Wh-capacity, Li-Ion battery (14Ah @ 48V), the largest I had ever tested on an electric bike, gave the Polarna a very significant range advantage, although also with more weight: 29-56 miles on fully-electric and 53-69 miles with pedal assist (the manufacturer did claim more conservative numbers of 24-35 and 30-32 miles, respectively.) My past experience found that it should theoretically be able to handle at least 140 miles with PAS only used for short uphill climbs. I prefer pedaling most of the time for exercise/health purposes and only invoke the motor just enough to get up a hill. This can be done by switching PAS from 0 to one of 5 levels, or pushing the thumb throttle on the left side handlebar while in PAS 1 or higher. That leads me to some of the things I did not like about this bicycle.

Unlike the Metakoo Cybertrack 100, every bike I had tested could not activate the throttle while PAS was turned off or set to level 0, the Polarna included. This perhaps is a safety feature to prevent accidental acceleration when power assist was disabled, but I really enjoyed Metakoo’s implementation because it allowed me to pedal unassisted at all times and ONLY power on the motor when I turned the throttle. The Polarna (and all other bikes) required changing the PAS to level 1 before the throttle could temporarily be activated. One would then have to change PAS back to 0 for non-motorized operation. It is a very minor gripe that I got over very easily with my Googo, and it perhaps is best for the rider’s safety to NOT allow on-demand assist with PAS off.

Ignition: Key Positions (Jasion EB7 eBike)

Two keys were included and required to operate the bike’s battery. So, do NOT lose them! The “ignition” could very annoyingly be found below the down tube over which some cabling ran, and the bicycle could not power on without leaving the key inside. That made me a bit upset even though the lock also served to secure the battery. If the key needed to be left in the ignition, then moving it to the handlebar or another accessible location instead would have made for easy insertion/removal (like the Evercross H5 eScooter). Having it at the bottom required one to crouch to align the key with the insertion hole, and if the key was in the incorrect locking position, it could potentially fall off and leave you scrambling to find it. I attached a velcro to it and the cable to prevent that from happening. Most riders would likely just decide to leave the key in at all times. Furthermore, the key positions were NOT labeled on the Polarna. I have included a picture from the Jasion EB7 bike for reference.

The battery was housed within the down tube and removing it was inconvenient: first, turn the key to the unlock position, then fold the frame in half to allow the battery to slide out. On the flip side, this mechanism kept the battery safely protected within the tube and also helped to keep the bike compact.

Battery Removal, Locking Mechanism

Front wheel skewer unfortunately was not the quick-release type. This made it harder to steal the tire, but also less convenient to fix flats without bringing a wrench to undo the bolts.

The serial number was etched onto the frame by the left crank.

Polarna included a 109W AC brick to charge the battery within about 4-6 hours. The battery could be left charging within the down tube or removed for energizing by your desk.

Despite the shortcomings I had mentioned — particularly the frustration of needing to leave the key inside the ignition underneath the down tube — this electric bicycle made is a BEAST. It was a joy to spin for both my friend and I, and the build quality and riding comfort were top-notch. For me, personally, the 750W motor provided for a very smooth, strong acceleration, but keep in mind that it could scare a beginner rider for the first time when that initial power kicks in. I felt solidly in control and the suspension worked well in conjunction with the fat tires to even out the effects caused by rocky or shaky terrains. Like Jasion, if Polarna could figure out how to move the ignition to the handlebar, I would have been an even happier rider. Very solid, foldable bicycle.


  • Nominal (average) power: 750W. Rated (maximum) power: 1,000W
  • Jasion: 500W (700W peak?)
  • Googo: 350W (560W peak) / Metakoo: 350W (500W peak) / Ancheer: 500W (700W peak)
  • 750W may give beginner riders an initial scare the first time the motor kicks in with a very sudden, Rapid speed increase
  • Fully electric: No pedaling necessary
  • PAS – Pedal Assist System: Get assistance while pedaling
  • Motor off: Move bike with the power of your own legs 😉
  • On demand: Turn handlebar thumb throttle to manually increase speed and motor assist level

Key Lock, LCD, USB Charging Port

  • Battery: 672Wh Li-Ion (48V @ 14Ah) (Model: FZZ006/X1)
  • Detachable with Lock and one of 2 keys for more convenient, off-bike charging
  • Only used about 20% on a 32-mile trip
  • Motor was only activated to assist with uphill climbs, and the rest of the time was pedaled manually
  • Range: 24-35 Mi on fully-electric, 30-32 Mi on pedal assist modes (according to manufacturer)
  • Our own tests found the range to be more like 29-56 Mi on fully-electric, 53-69 Mi on pedal assist modes
  • Approx. 140 Mi with occasional pedal assist based on our 32 Mi ride with motorized help only on uphill climbs
  • Manufacturer claimed empty to 100% in 4-6 hours. My tests agreed
  • Bikeable in rain but do NOT go through water that is high enough to reach the motor or battery!

Shimano Derailleur, Rear Suspension

  • Shimano 8 speeds
  • When the battery is out, the higher number of gears will allow easier, more effective, manual pedaling
  • Front level is adjustable for increased pedal efficiency at the expense of comfort
  • Displays speed (mph by default) (current, average, max) / battery level / motor assistance amount (PAS 0-5) / odometer / trip distance and time / and more
  • When motor assistance level is set to 0, motor does not turn on, and you will pedal fully manual

Serial number is etched into the frame by the left stem for registration with local police to aid with recovery.

  • Arrived practically fully assembled
  • Should take 5 mins to finish build by simply screwing the collapsible pedals onto their respective crankshafts
  • Make small tuning adjustments to the handlebar and seat post height as needed
  • Surprisingly, neither the front nor rear disc brakes needed any adjustment (this rarely happened with any bike I had previously built — Jasion was the other exception)
  • Foldable, aluminum alloy frame with rider support for up to 360 lbs
  • Excellent built quality and compact
  • Folded: 37″ L x 33″ H x 22″ W / Unfolded: 67″ L x 48″ H x 23.2″ W
  • Seat height: 25.5″ minimum
  • Streamlined cabling along the bottom of the down tube
  • 20″ Fat Tires (20 x 4.0 tube) for more controlled, comfortable rides
  • Jasion EB7’s tubes were 20 x 3.0
  • When deflated to a low pressure, fat tires perform better on snow and sand than road or mountain ones by not sinking as much
  • Uses Schrader valve with recommended pressure of 30 psi (max)

Tip: Fat tires, when deflated to a low pressure, perform better on snow and sand than road or mountain ones because they do not sink as much.

  • Weight: 68 lbs. Heavier than our previously-tested Jasion/Googo/Metakoo/Ancheer and a non-electric Santa Cruz Heckler
  • Extra weight due to a larger battery and stronger motor


  • Very inconvenient to insert key to power the bike on or to lock/unlock battery because it requires you to crouch down considerably
  • Cabling running across it adds to the frustration
  • May accidentally lose the key during a ride if switched to the wrong position
  • Key could get damaged if down tube hits a hard object. It could also get dirty from mud
  • Key may not be replaceable
  • No on-demand pedal assist while PAS is off (set to level 0). Minor gripe but would have been a nice-to-have
  • Googo and Ancheer were the same way. Only Metakoo’s Cybertrack 100 had the option to temporarily kick on the motor by turning the handlebar throttle
  • Top speed went well past the 20mph federal, California State, and local laws
  • Could not find where to purchase an extra battery, not even on manufacturer’s website at polarnaebike.com
  • Printed guide had you look closely at each pedal’s threading to determine which crankset to screw onto
  • Front wheel skewer is not quick-release
  • Cons: inconvenient to fix flat tire, especially if a wrench was not brought for the bolts. Takes more time to attach/detach wheel
  • Pro: Slightly better theft deterrent. Casual thieves do not like to spend more time than necessary
  • Metakoo included a 168W wall charger (4A @ 42V) that allowed its battery to go from empty to 100% in as little as 3 hours. Polarna’s 109W charger took 4-5 hours
  • May not be possible to get a matching replacement. So, do NOT lose them!
  • Some may prefer a handlebar throttle instead of the thumb throttle
  • Heavy at 68 lbs due in part to a larger battery


  • Covered charging port is on the removable battery itself
  • AC charging brick LED: Red = Charging. Green = Full
  • Lithium Ion batteries are known to be volatile and could catch on fire
  • Do not charge overnight or unsupervised for prolonged periods of time. Stop charging once full
  • Do not leave the bike in full sun or below freezing
  • Lithium-Ion batteries lose about 20-25% of capacity after every 500 charging cycle
  • Ensure seat post is locked and tight


Polarna M4 Electric Bicycle

  • Motor: Switch battery on and turn on display by long-pressing the Power button on the controller
  • Set Pedal Assist to level 1 or higher by pressing “” button. Motor kicks in as you pedal
  • Throttle the thumb accelerator by the left-side handle, and the motor will fully take over (Power on demand)
  • The more you push, the faster the bike will go
500w, 750w, e-bike, does
  • Helps with walking the bike uphill at 3.7 mph (6 km/h)
  • Be aware of unexpected obstacles. I tumbled once while mountain biking and was hurt quite badly. It was not fun

Aircraft Transport

Most, if not all, airlines prohibit electronic scooters and bikes that do not meet specific criteria. United Airlines, for example, allows collapsible ones whose battery is both removable and below 300 Wh. Southwest Airlines is more restrictive at 160 Wh. This bike’s battery is 672 Wh. Lithium-ion batteries are known to be volatile, and the higher their capacity, the more risky they are. Check with the airlines, TSA, and FAA for more details.

Bike Assembly

Here are some installation tips for those assembling their first bicycle. There is a diagram below to identify the major bike parts.

Bike Repair Stands

I use a repair stand to help with assembly and maintenance. SereneLife SLBKRS3 has a maximum load capacity of 66.7 lbs — enough to carry most electric bikes without falling over.

SereneLife Bike Repair Stand, Metakoo Cybertrack 100 mountain eBike

For easier maintenance or assembly, a bike repair stand can save a lot of time and back pain. Be sure to get one that can hold up your bicycle’s weight.

Bike Parts

Bicycle Parts /Al2 (CC by 3.0, Wikimedia CurID 2995998)

Motor Bike Laws

I first learned about laws governing motorized scooters when reviewing the Joyor X5S, and unfortunately, they were (and still are) not straight-forward. There had been a number of accidents involving scooters hitting pedestrians or riders hurting themselves. I get it. Laws are there to protect people from each other and themselves, especially from irresponsible individuals.

Electric bikes can result in severe injuries or death with their high speeds.

Surprisingly, the laws governing electric BIKES are much more lax. They are very similar to non-motorized bikes, in fact! There are different classes of eBikes. This Jasion falls under the lower-speed Class 2 with a maximum of up to 20 mph, and as such, can be used on Class 1 bike paths in California. All 3 classes can ride on the protected, one-way Class 2 bike lanes found on streets and highways. Be sure to check with your local regulations. Some States categorize eBikes as mopeds or motor vehicles.

  • Class 1: PAS-only with no throttle. Max assisted speed: 20 mph
  • Class 2: PAS and throttle. Max assisted speed: 20 mph
  • Class 3: PAS-only with no throttle. Max assisted speed: 28 mph

California Law

Disclaimer: I AM NOT A LAWYER. Please consult your local city, police department, and/or legal professional for advice.

The following is my interpretation of how I understand the law. It has been shortened to only point out parts that I found interesting or noteworthy.

Mountain biking with Cybertrack 100 /Metakoo

  • Does NOT require riding with a Driver’s License or Instruction Permit (eScooters require them!)
  • No license plate required
  • Passengers are allowed as long as the bike was designed for it
  • Can ride on existing bike infrastructure
  • Speed limited to 20 mph
  • Follow most of the same laws as non-motorized bicycles
  • Helmet required for riders 17 years and younger
  • No minimum age limit


Some accessories I recommend for this bike for added convenience and safety:

  • Molik Bike Handlebar Bag
  • Salzmann 3M Spoke Reflectors: For increased visibility in the dark
  • Bar End Bike Mirrors (like Brisk, Tagvo, or Zacro): To see behind you
  • Rear rack seat cushions
  • Burley Trailer Coupler: So trailer can be switched to another bike (ie. bike failed or ran out of battery)

Final Thoughts

I thought the Jasion EB7 was one heck of a Fat Tire electric bicycle, but then my friend brought her Polarna M4 along, and I was blown by its sheer power and workmanship. Granted, the latter sold for 260 more and was considerably heavier due in part to a heftier 750W motor and larger battery. Topping at an unmanned 39mph and 33mph with me sitting on it, its speed was exhilarating, dangerous, and potentially illegal due to federal, California State, and local city limit of 20mph.

Overall, the Polarna handled hills exceptionally well on some steep mountain trails, and the larger battery capacity should provide plenty of power to help the rider not cramp up the thighs on longer trips.

My family and I had very much enjoyed exploring town together instead of idling around in the car. It is both a healthy activity and a great way to bond with one another while building up the children’s confidence and endurance. I have not found myself going back to a non-motorized bicycle for daily rides, although I would still only take out my trusty Santa Cruz Heckler for more advanced mountain thrills.

Having the option to dynamically turn on or off electronic pedal assist is GREAT — that way, you can go manual, motor assisted, or all motorized.

Where To Buy

  • Molik Bike Handlebar Bag
  • Salzmann 3M Spoke Reflectors
  • Bar End Bike Mirrors: Brisk, Tagvo, Zacro
  • Rear rack seat cushions
  • Additional Trailer Coupler so Burley can be switched to another bike (ie. bike failed or ran out of battery)


  • HeyBike Cityrun: Beautiful, 26″ electric cruiser bike with 500W motor, 7 speeds (21mph)
  • Jasion EB7: 20″ foldable, electric, 7-speed bike with fat tires, 500W motor, 20mph max
  • Googo SY26: 26″ electric mountain bike with 21 speeds, large informative LCD, electronic headlight and horn, and solid build
  • Metakoo Cybertrack 100: 26″ electric mountain bike with 21 speeds and a clean look
  • Ancheer AM001907/AN-EB001: 26″ electric mountain bike with 21 speeds, electronic headlight and horn, and powerful, Rapid acceleration
  • Macwheel Ranger 500: Comfortable, 7-speed, electric cruiser for city commutes
  • Gyroor C3: Single speed, electric, semi-foldable, and priced fairly low

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