Electric Vehicles For India News & Reviews A 30 MPH folding fat tire e-bike with full suspension!

A 30 MPH folding fat tire e-bike with full suspension!

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The Polarna M4 electric bike may not look fancy, but it hides away a lot more e-bike than you bargain for. 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.

We usually see them start well above $2,000 and go up quickly from there.

But at a price of just $1,399, the Polarna M4 brings that full-suspension fatty goodness to the masses at a much more affordable price.

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.

Take a gander at the e-bike in action in my review video below. Then continue on for the rest of my complete review.

Polarna M4 e-bike video review

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)
  • 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
polarna m4

Fat and foldy

The Polarna M4 does exactly what a fat tire e-bike is meant to do: it rides over just about everything.

While larger 26″ wheels are the kings of all-terrain riding, the 20″ tires here still do nearly as good off-road, especially when you keep the pressure down in the 10-12 PSI range. Depending on how soft the ground is, you can even go lower.

When you’re back on the road (and using a bit higher tire pressure), the Polarna M4’s 750W continuous-rated motor uses every watt at its disposal to take you up to nearly 30 mph.

The company claims that it reaches 32 mph, but after de-limiting the bike via the display I was mostly hitting 28 or occasionally 29 while riding on flat ground, with occasional spurts into 30 mph territory. Perhaps they had the help of a tailwind when they quoted it.

The color LCD screen is easy to read both during the day and at night, and it actually looks quite good. I’m so used to monochrome screens that color displays often still catch me off guard. It’s definitely a sharp-looking screen.

The headlight though, goes the other way. As nice and bright as the screen is, the headlight is a bit lackluster. It works, but it doesn’t really light your way that well. It’s a be-seen light and is pretty much only meant to let cars know that you’re there. That’s fine on an e-bike, but for something like this that is meant to travel off-road as well, a brighter light could have been nice.


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