Heybike Mars 2.0 Review, 2024
An affordable multi-purpose folding bike with a smooth ride and serious speed!
Historically, 750W rear-hub motors have been uncommon on folding e-bikes; after all, they’re generally more focused on portability than power. The Mars 2.0 eschews tradition with its drive system, offering punchy acceleration for thrills and potent uphill power.
A full suspension is another seldom-seen feature on folders, but the Mars 2.0 offers both a suspension fork and seatpost to soften and smooth out the ride. With 65mm of travel on the fork and around 45mm on the seatpost, there’s enough cushion to make commuting or light off-roading comfortable and that much more fun.
Another feature that the Mars 2.0 offers that you won’t find on folding bikes from many other brands is a massive level of customization through the Heybike app. With the touch of a button, riders can adjust the number of pedal assist settings, the maximum speeds in each setting, the bike’s overall top speed, and more!
Read on to see our full Heybike Mars 2.0 review below, where we discuss the bike’s specs, features, and performance in our series of standardized tests.
Pedal assist up to 28 mph
- A punchy 750W (1200W peak) rear-hub motor with quick acceleration and uphill power.
- Comfortable and smooth thanks to the suspension fork with 65mm of travel and suspension seatpost with 45mm of travel.
- Adjustable, customizable top speeds and individual PAS limits through the Heybike app.
- Carries up to 120 lbs on the rear cargo rack (that also just looks cool!)
- Dialing in throttle speed is easy with limits tied to the pedal assist system.
- An adjustable and relaxed upright riding position.
- Functional for commuting with Class 3 speeds up to 28 mph.
- Stability, responsive handling and off-road capability with 20”x4” knobby fat tires.
- Available in 4 color options with unique choices like Pumpkin Orange and Dusty Blue.
- The ride is relaxed and easy thanks to the cadence sensor, but we’d prefer a wider gearing range to avoid ghost pedaling.
- The Heybike app offers uncommon features, but it needs some tweaks – like the ability to adjust max PAS and throttle speed separately.
- We liked the motor’s power once it engaged, but we hope to see faster re-engagement in the future.
- Something to be aware of: the bike weighs 64 lbs with the battery removed, making it less practical for folding and transporting regularly.
- Battery: 48V 600Wh, external removable lithium-ion battery
- Display: Multifunctional LCD
- Motor: Brushless geared hub motor, 80Nm, 750W/1200W Peak Motor
- Headlight:Integrated LED
- Taillights:Integrated LED
- Pedal Assist: 0~5 level pedal assist
- Range: 30 ~ 45 Mi
- Throttle:Thumb throttle included
- App:Heybike App
- UL Certification:
- Claimed weight: 75 lbs (72 lbs actual)
- Rider height range: 5’3″ ~ 6’1″
- Maximum load on the rear rack: Up to 120 lbs
- Total payload capacity: 330 lbs
- Brakes:File mechanical disc brakes w/ 180mm rotors
- Fenders: Front and rear fenders included
- Fork: Spring Fork, 65 mm travel with preload adjustment and lock-out
- Frame: Aluminum alloy
- Drivetrain: 7-speed Shimano Tourney, 48T chainring, 14-28T cassette
- Grips: Ergonomic Faux Leather
- Saddle: Custom Heybike saddle
- Handlebar: 620mm, low-rise
- Kickstand: Alloy
- Pedals: Folding platform
- Tires: 20″x4.0″ with puncture protection
Heybike Mars 2.0 Review: Speed Test
Our test bike shipped as a Class 2 e-bike with its throttle and pedal assist system (PAS) limited to 20 mph, but using the Heybike app we were able to open it up to its full Class 3 mode. We performed Speed Tests in each Class mode to determine the pre-programmed limits in each PAS setting while riding along a flat, predetermined course of local bike paths.
Prior to engaging the PAS, we soft-pedaled the bike with no assistance at 7.8 miles per hour; we could have pedaled faster, but we wanted to clearly observe the difference the motor made.
In Class 2 mode, we recorded a maximum speed of 8.4 mph in PAS 1, providing a subtle boost that might be best for newer riders or those who prefer a calm ride. The Mars 2.0 rocketed ahead in PAS 2, carrying us to 14.2 mph, then did the same thing in PAS 3 by delivering a max of 18.4 mph. The boost in PAS 4 was more subtle since the bike was already so near to its Class 2 limit; we reached the ceiling of 20mph. PAS 5 brought no change in speed since the motor was already at its cutoff point.
In Class 3 mode, we observed similar results in PAS 1, 2, and 3, with maximum speeds of 8.2 mph, 14.2 mph, and 18.4 mph respectively. There was a measurable difference in PAS 4, where the bike topped out at 21.2 mph. The largest power increase occurred when moving up to PAS 5, where we reached 27.9 mph.
After performing this test, we usually analyze the distribution of speed and power between settings, but this is less relevant on the Mars 2.0 since the Heybike app allows users to fully customize the limits of each setting.
Still, if we look at the standard distribution, we see a relatively common pattern in the data from our Class 2 test, where the increases in power are measured and consistent on the low end, but taper off as they approach the 20 mph limit toward the top. The Class 3 data shows that the motor had much more “breathing room” on the top end, though the max speed in PAS 4 is a bit lower than expected in comparison to the rest of the settings.
With a 48V electrical system, a motor that peaks at 1200W, and a maximum torque output of 80 Newton-meters (Nm), it was no surprise that the Mars 2.0’s acceleration was so punchy; the motor can draw power rapidly and output a significant amount of force.
When testing the throttle, we appreciated that its acceleration built more slowly and steadily, and we liked that the throttle speed was tied to the same limits as the PAS (though this too can be adjusted in the app). This made it easy to find a consistent riding speed without the need to hold the throttle lever somewhere in the middle of its travel.
A downside is that, when adjusting the top speed of the PAS to 28 mph through the Heybike app, the throttle’s maximum speed was also brought up to this limit. In most locations in the US, throttle speed must be limited to 20 mph when riding on roads, so we highly recommend that Heybike divide the maximum speed setting so that throttle and PAS speeds can be adjusted separately.
Otherwise, while we advise some caution to those who prefer a calmer ride, we found the Mars 2.0’s performance in this test to be spirited and exciting. We greatly appreciate the ability to fully customize the individual PAS settings, and we were pleased to note that the bike could easily reach and maintain its Class 3 limit.
Heybike Mars 2.0 Review: Range Test
To evaluate the range potential of the Heybike Mars 2.0 and its 48V, 600 Wh battery, we pedaled the bike continuously in two separate tests using the maximum and minimum (practical) level of pedal assistance until its battery expired. We chose PAS 2 for the low power range test, as we believe most riders will find the 8 mph limit in PAS 1 to be too slow.
We traveled 21.7 miles in PAS 5, and 32.2 miles in PAS 2; riders who vary their assist level will likely observe results between our bookend values.
Heybike advertises a range of 30 to 45 miles, which seems somewhat ambitious based on our PAS 5 results, though brands often estimate range using best-case (most efficient) conditions, e.g. a lightweight rider on a flat course in clear weather. Considering the difference in power between PAS 1 and PAS 2, we think it is reasonable to assume those using the lowest setting would be able to approach the advertised range.
Compared to similar folding e-bikes we have tested previously, the Mars 2.0’s range was relatively low in both tests. We attribute this primarily to its battery capacity.
We usually hope to see battery capacity in equal measure to the motor’s nominal wattage; with a 750W motor and 600 Wh battery, the Mars 2.0 is on the low side with its power source. In our testing, this meant that it simply had less charge to use, and when using a higher level of assistance in PAS 2, it burned through the charge faster.
In truth, the Mars 2.0’s motor/battery pairing is relatively efficient; based on its specs, we expected our PAS 5 test to last just 55 minutes. With a final time of 1 hour and 20 minutes, we observed an increase in duration of 45%.
Regardless, the (roughly) 22 to 32 miles we measured should cover a number of short leisure rides or even a longer commute. The bike comes with a 2-amp charger that can recharge the battery in just over 6 hours, so riders can fuel up during work hours and be ready for the ride home.
Heybike Mars 2.0 Review: Hill Test
Fortunately, the Mars 2.0’s powerhouse of a motor was not intimidated; the bike successfully carried us to the top of the hill in both tests. Using its throttle, the trip took 1 minute, 20 seconds while the bike traveled at an average of 13.6 mph. When pedaling in PAS 5, our time was reduced slightly to 1 minute, 14 seconds and our speed increased to 14.7 mph.
The Mars 2.0’s results were on the mid-to-high end when compared to other folding e-bikes we’ve tested; most of these used less-effective 500W rear-hub motors. Interestingly, the Mars performed better than the handful of other folding e-bikes with 750W motors we have data for – but with 1200W of peak power and 80 Nm of torque, this was no surprise!
We recently tested the Ranger S, another folding e-bike from Heybike with similar specs, including nominal motor wattage, weight, torque, etc. This bike was unable to climb Hell Hole Trail with its throttle, but was successful – though slower – in PAS 5. This suggests that the Mars 2.0 has more low-end power (like a tractor) for more effective climbing.
Our test results show that the Mars 2.0 can confidently power over intimidating, steep hills quickly and effectively. It’s capable enough to give riders the option of pedaling or simply throttling to the top, but even when using pedal assistance, riders can relax and casually soft-pedal with little effort.
Heybike Mars 2.0 Review: Brake Test
The Mars 2.0 is equipped with Filel mechanical disc brakes with 180mm front and rear rotors. We tested their performance using the process described above, arriving at an average stopping distance of 23’-11”.
When compared to other e-bikes with mechanical disc brakes – including many folding e-bikes – this result is on the long side, though it is within the range that we consider safe and effective. We attribute the Mars 2.0’s slower performance to its weight and the type of brake system it is specced with.
Typically, mechanical disc brakes have less effective stopping power than hydraulic disc brakes, though they are often used on folding e-bikes for two reasons. First, mechanical brakes are simpler and less expensive, so they help to reduce overall cost. Second, they mitigate the risks of brake line pinching during the folding process; mechanical brakes will continue working, where hydraulic disc brakes can leak and fail.
The Mars 2.0 weighs a hefty 72 lbs including its battery, which is decidedly heavy for a folding e-bike. With mechanical brakes and so much mass, the bike’s brake system has to work even harder to slow the bike effectively.
To be clear, the brakes functioned appropriately; when riding the bike downhill, they effectively modulated the bike’s speed and stopped it safely. We wouldn’t be upset if Heybike specced hydraulic disc brakes in the future to improve the Mars 2.0’s overall braking performance (like they did with the Ranger S), though we understand why they chose mechanical brakes on this more affordable model.
Heybike Mars 2.0 Review: Ride Quality
Starting with the good, the ride was comfortable! The bike is offered in a single frame size to accommodate riders from 5’-3” to 6’-1”. Most of our riders are in the neighborhood of 6 feet tall, and we were able to set a comfortable saddle and handlebar position with proper leg extension with room to spare.
The suspension seatpost was an especially appreciated feature; its springiness absorbed dips and bumps while also adding a degree of fun to the ride. The saddle was also comfortable and accommodating with thick padding, and the ergonomic faux leather grips were supportive.
We found the handling to be predictable; the 20”x4” Chaoyang fat tires made the bike feel zippy and maneuverable, while its weight and tire width kept the bike planted and stable. The 620mm low-rise handlebars felt somewhat narrow, though fortunately they did not make the steering twitchy.
Many of the included accessories were relatively unique. The integrated headlight used 4 individual LEDs. The cargo rack has an impressive 120 lbs of carrying capacity, and it includes a pegboard pattern on its sides for securing smaller items. Standard features such as a tail light/brake light and fenders are also included, but the bike can be outfitted with a number of optional accessories like cargo baskets/bags, side mirrors, surf racks, etc.
After testing two of Heybike’s models previously, we anticipated that the Mars 2.0’s cockpit would be relatively crowded, but we were pleasantly surprised to note its compact but well-organized feel. Aside from the expected elements of the brake levers, shifter, control panel, and display, the Mars 2.0 includes only a single additional button panel to activate the electronic horn and the lights.
Moving from PAS 1 to 2 required upshifting by 4 gears, but by the time we reached PAS 3, the gearing range was not wide enough to keep up with the motor, which resulted in ghost pedaling (an extremely fast cadence was required to help propel the bike). Ultimately, ghost pedaling makes for an easy ride, but we’d prefer to keep our pedaling engaged.
Additionally, the bike’s initial motor engagement seemed appropriate, but re-engaging the motor after coasting or braking often took multiple full rotations of the cranks. Many of the best e-bikes we’ve tested with cadence sensors re-engage with just a slight movement of the cranks, so we’d challenge Heybike to improve the sensitivity of the PAS.
When it comes to the folding aspect of the Mars 2.0, the bike functioned expectedly; in truth, we have not tested many outliers with unusual methods or mechanisms. The bike’s telescoping stem folds to the side, the frame is split with a central hinge, and the pedals fold to save on space.
We found the bike’s overall weight of 72 lbs/64 lbs with/without the battery to be fairly cumbersome; those planning to fold and transport the bike regularly may need a helping hand. Once collapsed, the bike measures approximately 40”L x 20”W x 29”H.
Heybike Mars 2.0 Review: Summary / Where to Buy
The Mars 2.0 generally performed well in our series of tests, though we enjoyed its punchy acceleration and its ability to flatten hills while providing a comfortable and smooth ride. The Heybike app was another element of the bike we appreciated; its level of customization and flexibility is uncommon, despite the fact that we think it would benefit from a few updates.
We had a few notable areas of critique – in the app, we think it’s important to be able to adjust PAS and throttle speed separately. Our other concerns were the limited gearing range and the speed of the motor’s re-engagement. And while it’s less of a point of critique and more of something to be aware of, we found the Mars 2.0’s weight to be a bit difficult to manage for a folding bike.
With those things in mind, we think the Mars 2.0 is well-suited for commuting to work or school, running errands, taking leisurely weekend and evening rides, or coming along in the family RV. It offers thrilling speeds, plenty of cargo space, a comfortable ride, and more… all at an affordable price.
Happy Riding! Make sure to let us know if you have any questions or if you think we left anything out in this review of the Heybike Mars 2.0 down in our comments section.
Phil cuchetti says
I ordered and paid for one of these and have not heard anything from the manufacturer about shipping time or when Imwill receive my bike . Their customer service su seems very poor . I’m beginning to wonder if I’ll ever receive it .
Richard says
One of the captions mentions a “Chatham Rev 2”. If this is a typo, please fix it!
John S. Bozick says
Fixed! Thanks for pointing that out.