- Shipping & Returns
Crestone GX Eagle/Mastodon Complete Fat Bike
Over the years fat bikes have gained a reputation as the slow, plodding adventurer of the bicycle world, but Borealis blows that old stereotype out of the snow with the Crestone GX Eagle/Mastodon Complete Fat Bike. Pairing a stiff carbon fiber frame, plush 27.5in fat tires, a Manitou Mastodon suspension fork, and SRAM's workhorse GX Eagle groupset, this bike is a lightweight and versatile steed chomping at the bit to take on snowy trail adventures and beyond. Tell your other bikes they'll be getting a lot of rest this winter, layer up, and head out into the wilderness.
Borealis built the Crestone frame using cutting-edge carbon fiber construction methods to finely tune the ride quality, resulting in a lightweight yet impressively strong frame that will hold up to heavy use. That's particularly important since the addition of the 100mm travel Mastodon invites you to take more difficult line choices. Nimble handling and low weight are helpful attributes on fat bikes, and you'll appreciate pedaling around the Crestone with its lightweight carbon fiber frame and quick-handling geometry. Not unlike an XC race bike, Borealis gave the Crestone a relatively steep 70-degree head tube angle and a shorter reach to keep you in a comfortable position and help quicken the steering of that big wide front tire. The geometry is also well suited for bikepacking and touring, helping you cover ground quickly and efficiently.
This Crestone is built up with 27.5 x 4.0in tires on 80mm rims, providing a solid platform to roll on snow or loose terrain while remaining sprightly compared to extra fat and voluminous 26 x 4.8in fat bike tires. 27.5in fat tires have shorter sidewalls than their 26in fat tire counterparts, contributing to more precise cornering, less tire bounce, and a faster feel on packed snow or moderately loose terrain. This gives the Crestone an even livelier feel with improved rollover characteristics, though you can always switch to some fatter tires later on if you need maximum flotation for fresh snow or deep sand.
- A lightweight carbon fat bike for winter adventures and beyond
- Stiff and light carbon construction increases efficiency
- Snappy geometry for quick and nimble handling
- Mastodon fork for extra traction and cushion in rugged terrain
- 27.5 x 4.0in fat tires balance rollover with flotation
- Carbon fiber bar and post improve comfort and shed weight
- GX Eagle drivetrain offers wide gear range, crisp shifting, and impeccable chain retention
Tech SpecsFrame Material
Manitou Mastodon EXT Pro
SRAM GX Eagle 12-speed
SRAM GX Eagle 12-speed
SRAM GX Eagle Alloy
Crank Arm Length
Bottom Bracket Type
BSA threaded 100mm
SRAM XG-1275 GX Eagle 12-speed
10 - 50t
KMC X12 12-speed
SRAM Level T
160mm SRAM CenterLine
Borealis Carbon Bar 35mm
[small - large] 50mm, [x-large] 70mm
Borealis Carbon 31.6mm
[rims] Sun Ringle Mulefut 80mm
15 x 150mm thru-axle
12 x 197mm thru-axle
Terrene Cake Eater
27.5 x 4.0in
5 years on frame
* Delivery Time.
We need 1-2 days to process your order before shipping.There are two shipping methoed. Fast Delivery: The delivery time for US, European countries the delivery will take 3-5 days.Slow Delivery: The delivery time for US, European countries the delivery will take 10-15 days.
* Tracking information.
After we ship package, customer receive automatic email with tracking details.
* Lost Package Policy.
If a package did not arrive in 4 weeks after the shipping date, then this package is treated as Lost. In this case a new package will be shipped to the customer provided we are able to give the same items as those purchased by the customer. If we are not able to provide the same items to substitute the lost ones we will either propose to the customer similar items or refund their cost as it will be mutually agree with the customer. If one or more items neither the same nor similar are available to be shipped, the customer can request to cancel the order entirely, thus the total cost of the order including shipping and handling cost will be fully refunded.