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  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike
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  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike 3/4 Back
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
  • Borealis Bikes GX Eagle/Mastodon Complete Fat Bike Detail
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Borealis BikesCrestone
GX Eagle/Mastodon Complete Fat Bike
$3,450.00

Item # BOR000Z

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  • Merlot/Grey, S ($3,450.00)
  • Merlot/Grey, M ($3,450.00)
  • Merlot/Grey, L ($3,450.00)
  • Merlot/Grey, XL ($3,450.00)
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Item # BOR000Z
Description

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 SpecsGeometry
Tech Specs
Frame Material
carbon fiber
Fork
Manitou Mastodon EXT Pro
Front Travel
100mm
Headset
Borealis
Shifters
SRAM GX Eagle 12-speed
Rear Derailleur
SRAM GX Eagle 12-speed
Crankset
SRAM GX Eagle Alloy
Chainring Sizes
30t
Crank Arm Length
175mm
Bottom Bracket
SRAM DUB
Bottom Bracket Type
BSA threaded 100mm
Cassette
SRAM XG-1275 GX Eagle 12-speed
Cassette Range
10 - 50t
Chain
KMC X12 12-speed
Brakeset
SRAM Level T
Brake Type
hydraulic disc
Rotors
160mm SRAM CenterLine
Handlebar
Borealis Carbon Bar 35mm
Handlebar Width
740mm
Grips
Ergon GA2
Stem
Borealis
Stem Length
[small - large] 50mm, [x-large] 70mm
Saddle
Borealis
Seatpost
Borealis Carbon 31.6mm
Seat Collar
34.9mm
Wheelset
[rims] Sun Ringle Mulefut 80mm
Hubs
Borealis
Front Axle
15 x 150mm thru-axle
Rear Axle
12 x 197mm thru-axle
Tires
Terrene Cake Eater
Tire Size
27.5 x 4.0in
Pedals
not included
Recommended Use
mud/sand/snow
Manufacturer Warranty
5 years on frame
Geometry
 
SMLXL
a Seat Tube
15.04in17.01in19.06in21.02in
b Effective Top Tube
23.02in24.01in24.67in24.72in
c Stack
23.5in24.05in24.61in25.16in
d Reach
16.04in16.65in17.22in17.76in
e Stand Over
    
f Head Tube
4.13in4.72in5.31in5.91in
g Head Tube Angle
70o70o70o70o
h Seat Tube Angle
73o73o73o73o
i Bottom Bracket Height
    
j Bottom Bracket Drop
2.36in2.36in2.36in2.36in
k Chainstay
18.07in18.07in18.07in18.07in
l Wheelbase
    
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