Polarna M4 review: A folding full-suspension electric bike for fat tire adventures on the go

by Micah Toll

This fast and fun off-roader even folds to make it easier than ever to take a full-suspension fat-tire e-bike anywhere.

Full-suspension fat-tire e-bikes aren’t rare, they’re just usually quite expensive.

Whether you need a fold-up fat-tire e-bike to drive to a nearby trail network for your rides, or you want to keep an all-terrain e-bike in your RV for adventures at stops, or really any reason that would have you on the hunt for a less-than-gigantic e-bike, the Polarna M4 seems to fit the bill for high-spirited e-bike tomfoolery.

Polarna M4 tech specs • Motor: 750W rear hub motor in cast wheel • Top speed: 28 mph (45 km/h) • Range: Claimed up to 45 miles (72 km), more like half of that with fast riding • Battery: 48V 12.8Ah (614 Wh) • Weight: 68 lb (31 kg)

Polarna M4 tech specs (cont'd) • Wheels: 20 inches with 4-inch fat tires, cast rims instead of spokes • Brakes: Logan hydraulic disc brakes (160 mm rotors) • Suspension: Front and rear • Extras: Included fenders and rear rack, 8-speed transmission, front and rear LED headlight and tail/brake light, color LCD display, kickstand