Small 15" (5'2" ➡ 5'6")

Medium 17" (5'5" ➡ 5'10")

Large 19" (5'9" ➡ 6'2")

X-Large 21" (6'1" ➡ 6'5")

If you are in between sizes, we typically recommend sizing down. If you want to be safe, call or send us a message and one of our professional staff can help make a recommendation.


Borealis Frames and Rigid Carbon Forks have a limited lifetime warranty. All other Borealis branded components come with a one year limited warranty. All non-Borealis branded components come with the original manufacturer's warranty.

Please view our Warranty Policy for more information.

Return Policy

If you are unsatisfied with your purchase for any reason, you can return products within 30-days for a full refund. Returned items must be new condition.

Please review our complete Return Policy for more information.

Test Ride

If you are interested in test riding one of our bikes, Check our dealer map to find a retailer in your area.

Max Cargo Load

The max Cargo load for all Borealis Bikes is 300 pounds. This include the rider weight and all gear.

Payment Methods

Borealis accepts credit cards, debit cards, PayPal, and Affirm Financing.


Borealis offers 0% APR financing up to 36 months through Affirm.

Model Overview

Borealis offers three models:

Crestone: Our flagship carbon fiber fat bike. This is the ultimate premium quality carbon fiber fat bike. Select from our pre-assembled models or fully customize your bike.

Flume: Our aluminum fat bike that offers the best value and quality on the market. Select from our pre-assembled models or fully customize your bike.

Keystone: Our first ever Class I Electric Fat Bike, equipped for anything and everything. Any terrain, any season.