Heybike Mars 2.0 Review: A Value Folding Fat-Tire E-Bike

What it is

The Heybike Mars 2.0 is a folding fat-tire e-bike aimed squarely at the value buyer who wants one bike that does a bit of everything: commute on pavement, potter on light trails, and fold down to fit in a car trunk or a small apartment. On paper it is a lot of hardware for the money — a 750 watt motor, a 600 watt-hour battery, and 20-inch by 4-inch fat tires that soak up bad roads without a suspension upgrade.

The headline trade-off is set by physics, not price: a folding frame plus fat tires plus a big battery is heavy, and at around 75 lb the Mars 2.0 is no exception. “Folding” here means “fits in a trunk,” not “easy to carry up stairs.” If you live in a third-floor walk-up, read that number twice before buying.

Range: what to actually expect

Heybike claims up to 45 miles. Like every budget brand, that figure assumes the lowest pedal-assist level, a light rider and flat ground — conditions you will rarely all meet at once. The number that matters is the one we can verify: a 600 Wh battery. That is a genuinely usable pack, good for most real commutes with margin, but if you ride mostly on the throttle expect closer to half the claim. We would rather tell you the watt-hours and let you judge than repeat a marketing figure we cannot stand behind.

Ride, brakes and the app

The 750 W motor has enough torque to get a heavy bike and rider moving from a stop and up moderate hills, and the fat tires make the ride forgiving over potholes and gravel. The assist is a cadence-style system rather than a torque sensor, so power comes on in steps rather than smoothly — livable, and normal at this price, but not as refined as a more expensive bike. The Heybike app lets you adjust the speed and class, which is genuinely useful for staying legal: leave it in Class 2 for bike paths, and only unlock Class 3 if your local rules allow it.

Who should buy it — and who should skip

Buy it if you want a versatile, do-a-bit-of-everything value e-bike, you have a car or ground-floor storage where the weight is a non-issue, and you like the security of fat tires and a throttle. Skip it if weight is a dealbreaker (a lighter, non-folding bike like the Jasion EB5 will suit you better), or if you want the smoothest possible power delivery, which means spending up for a torque sensor. As always, budget for a real lock and lights alongside the bike.

One thing to know: Heybike no longer sells the 2.0

Heybike has replaced it with the Mars 3.0, and the 2.0’s clearance stock has run out: when we re-checked on October 19, 2026, Heybike’s own Mars 2.0 URL served its Mars 2.5 page instead — the 2.0 appears only as a column in a comparison table there, with no price and no cart — and no Mars 2.0 appears anywhere in Heybike’s catalog. An Amazon search for the 2.0 returns only the 3.0 and other Heybike models. The 3.0 swaps the cadence system for a torque sensor, adds Horst-link rear suspension, carries a 624 Wh battery, folds in about ten seconds and comes in a few pounds lighter — the sensor and the suspension being the two upgrades you would actually feel. Our Heybike Mars 3.0 review goes through all of it, including the top speed, class, weight and brake type Heybike declines to publish for the newer bike.

We have left the review above as we wrote it, because none of that hardware got worse the day the 3.0 arrived. But a bike you cannot buy new cannot hold a top slot, so the Mars 3.0 has taken over as the lead pick on our folding, hills and heavy-rider pages. It costs noticeably more. If the 2.0’s price was the point, our under-$1,000 picks include the folders that still sell at that level.