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  • Bikes
    CUSTOMIZE YOUR FAT BIKE, from $2,099
    Keystone ⚡ Class I Electric Fat Bike, from $6,199
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Assembled in CO Colorado

Making the Best Fat Bikes Since 2013

 (320) FAT-BIKE | (320) 328-2453
 SALE! 25% OFF NEW BIKES

Assembled in CO Colorado

Making the Best Fat Bikes Since 2013

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★ Reviews

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118 reviews
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86%
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115
J
Keystone - Electric Fat Bike⚡
John Clark
Back on the trails

The Keystone is my first e-bike having been a fat tire mtb enthusiast this was a no brainer, it is the most fun I’ve had on a fat tire bike. Love it !! thanks Borealis.

User picture
R
Flume Custom - Aluminum Fat Bike
Rico Sanchez
Great bike

What a great bike, love how light weight it is and soooo smooth!

D
Crestone (Carbon) - NEW Frame Only Size XL Midnight Blue & Bronze
David Johnston
Beautiful frame and paint

Bought this xl frame to replace my 5 year old crestone. There was nothing wrong with my old one (had 13,000 + miles on it) but the blowout price on the xl was so good i had to buy it. paint is incredible.

J
Keystone - Electric Fat Bike⚡
Jim
Best eFat ever!

This is my third eFat and although I liked other two - the Keystone is just beyond. I set mine up with a Redshift ShockStop seatpost (hardtail with benefits!), Ergotec 45 degree by 50 stem, carbon riser bar, and Schwalbe Al Mighty 4.8 tires (328 Billy Flamingo studs per baby!) The T-type drivetrain blew me away so much I converted my other bikes.

I also received unbelievable service from the Borealis sales rep during purchase.

Simply heaven!

M
Borealis Flat Pedals (Alloy)
Mike Fagerness
Great!!

They are great for Mountain Biking!!

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