Heybike Ranger S Review: The Long-Range Folding Fat Tire

What it is

The Heybike Ranger S is what the Mars 2.0 becomes when you spend more. It is a folding fat-tire e-bike with a 750 W hub motor, 20×4-inchtires, suspension, and — the reason it exists — a 692 Wh UL-certified battery. It weighs about 72 lb, which is roughly 3 lb less than the Mars despite carrying a bigger pack.

On Amazon it is one of the stronger options under about $1,300, and the case for it over the cheaper Mars comes down to three things: more energy, a certification claim, and a more comfortable ride. Whether those are worth the difference is a clean, answerable question.

692 watt-hours, and what the extra 92 buy

The Mars 2.0 carries 600 Wh. The Ranger S carries 692 Wh — about 15% more energy. That is not a transformation, and it is worth being precise about what it does and does not change.

At our standard 20 Wh-per-mileplanning figure for throttle-heavy riding, 692 Wh is about 35 milesagainst the Mars’s 30. Both are enough for most days. Where the difference shows is at the margins: the commute that was exactly at the edge of one charge is now comfortably inside it, and the winter ride — where cold can take a meaningful bite out of usable capacity — still gets you home.

Fat tires matter here. Four inches of knobby rubber has real rolling resistance, so this bike sits at the higher end of the watt-hours-per-mile range rather than the lower. Heybike claims up to 55 miles; treat 30–35 as the planning number and anything beyond it as a good day. Our range guide shows the method. A full charge costs about 14.5 cents at the current US average residential rate.

The certification is the quieter upgrade

The Ranger S’s pack is described as UL-certified. In a bracket where most listings make no safety claim at all, that is a real point of difference and arguably worth more than the extra watt-hours.

The CPSC’s micromobility guidance is direct about buying e-bikes and batteries certified to the relevant UL standards, and battery incidents are the one failure mode in e-bike ownership that is serious rather than inconvenient. Confirm the trim you are buying actually carries the claim — brands do sell certified and non-certified variants under one model name — and keep the habits regardless: supplied charger only, never charge unattended or overnight, charge away from your exit route, retire any pack that swells or runs hot. Our battery care guide is the full version.

Suspension and fat tires: comfort you can feel

Suspension plus 20×4 tires is a genuinely comfortable combination on bad surfaces, and this is the Ranger S’s most underrated advantage over a rigid fat-tire bike. The tires at low pressure absorb high-frequency roughness — the constant buzz of broken asphalt, seams, gravel. The suspension handles the bigger single hits: potholes, curb drops, roots.

The costs are honest. Suspension adds weight and is one more thing that can need service. Fat tires roll slower on smooth pavement and consume more energy per mile. And small-diameter 20-inch wheels — the price of folding — drop into holes more readily than 26- or 27.5-inch wheels do, which is part of why suspension earns its place on a folder specifically. If every mile you ride is on good pavement, a lighter road bike like the GoTrax F3 will be faster and go further on less energy.

“Folding” is about storage, not portability

This deserves saying plainly because the word misleads people into the wrong purchase. Folding a 72 lb bike changes its shape. It does not change its weight.

What folding genuinely buys you: it fits in a car trunk or the back of an SUV without a rack, it fits in a closet or under a stairwell in an apartment, it stores in a corner of a garage rather than occupying a bike’s worth of floor, and it can go in the back of an RV or a boat. Those are real and valuable.

What it does not buy you: carrying it up stairs, taking it on a bus or train as luggage, or lifting it into a car boot without effort. Seventy-two pounds is a proper lift from ground level, folded or not. If actual portability is the goal, the isinwheel U3at ~52 lb on 16-inch wheels is the different-category answer, and our weight guide sets out what each band means.

Check the trim before you order

Heybike sells a 1000 W variant alongside the 750 W bike, and configurations differ on whether fenders and a rack are included. Both facts create the same problem: two bikes with the same name and different specifications, sold through the same listings.

Read the listing for the rated motor wattage, the pack’s amp-hours and voltage, and whether the rack and fenders are in the box. A higher-wattage variant also potentially changes the bike’s legal class where you ride, which is worth knowing before rather than after — see our classes and laws guide. If a rack and fenders are not included, budget for them; a fat-tire bike without fenders throws a lot of road spray.

Who should buy it — and who should skip

Buy the Ranger S ifyou want a fat-tire bike that folds for storage, you value a certified battery and a genuinely comfortable ride over having the cheapest option, and your rides are long enough that 692 Wh is doing real work. For someone with limited storage who rides mixed surfaces, this is the most complete package here.

Skip it if budget is the binding constraint — the Mars 2.0is the same idea for less money with 15% less battery — if you need to carry the bike rather than just store it, or if you ride exclusively on smooth pavement, where the fat tires are costing you range and speed for cushioning you do not need.