Since 2013, Borealis has specialized in lightweight carbon fiber fat bikes. The Crestone is our tried and true flagship model. Its frame geometry is optimized for riding in snow and sand with clearance for up to 5” wide tires. Paired with the most technically advanced components in the industry, the Crestone sets the standard for premium quality carbon fiber fat bikes.
Standard features include: SRAM Eagle NX 12-Speed drivetrain, SRAM Level T brakes, rigid carbon fork, carbon handlebars, carbon seat post, durable Sun Ringle Mulefüt rims and your choice of tires.
Frame geometry provides responsive handling, offering maximum control for varying conditions in snow or sand.
Tire clearance up to 26x5” and 27.5x4.5”.
Compatibility for 100-120mm of suspension travel for more technical riding.
Lightweight, durable carbon fiber frame comes with internally routed cables, 2-3 bottle cage mounts and lizard skin protectors on both the down tube and drive-side chain stay.
Rockshox Bluto Fork tire size limitations: 26x5” or 27.5x4”
Mastodon Pro EXT Fork tire size limitations: 26x5” or 27.5x4.5”
Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5”
Dually 29x45 and 27.5x45 Rims – Max tire width: 3”
All rims 65mm to 85mm wide are compatible with tire widths of 3.8” to 5”
HED Carbon 100mm Rims – Max tire width of 4.6”
Based on our research, riders at the heights below will usually take the corresponding frame size. If you’re at a transitional height that spans two sizes, look at the geometry chart to get the Stack and Reach you like based on other bikes you are comfortable.
Borealis offers four frame designs with unique fit and geometry to suit your every Fat Bike need. Begin by taking a rough size approximation on the chart below that is based on height, then select the corresponding bike with your fit needs by using the geometry chart further below. We recommend a similar fit to you mountain bike, so grab a measuring tape and dial it in.
|EFFECTIVE TOP TUBE||23.02 in||24.02 in||24.8 in||25.59 in||585 mm||610 mm||630 mm||650 mm|
|SEAT TUBE CENTER TO TOP||15 in||17.01 in||19.06 in||21.02 in||381 mm||432 mm||484 mm||534 mm|
|HEAD TUBE||4.13 in||4.72 in||5.31 in||5.91 in||105 mm||120 mm||135 mm||150 mm|
|SEAT TUBE ANGLE||73 deg||73 deg||73 deg||73 deg||73 deg||73 deg||73 deg||73 deg|
|HEAD TUBE ANGLE||70 deg||70 deg||70 deg||70 deg||70 deg||70 deg||70 deg||70 deg|
|STANDOVER HEIGHT||Due to various rim and tire options stand over is not identified.|
|CHAINSTAY||17.91 in||17.91 in||17.91 in||17.91 in||455 mm||455 mm||455 mm||455 mm|
|BB DROP||2.36 in||2.36 in||2.36 in||2.36 in||60 mm||60 mm||60 mm||60 mm|
|REACH||16.04 in||16.65 in||17.22 in||17.76 in||407.3 mm||423 mm||437.5 mm||451.2 mm|
|STACK||23.50 in||24.05 in||24.61 in||25.16 in||597 mm||610.9 mm||625 mm||639.1 mm|
|Frame||Borealis Carbon, Internal Routing w/ Bottle Cage Mounts|
|Fork||Borealis Rigid Carbon fit tire up to 26x5" or 27.5x4.5"|
|Hubs||Borealis: Front 15x150, Rear 12x197 w/XD Driver|
|Tires||45N Dillinger 27.5x4.0 Tubeless Ready Folding|
|Crankset||SRAM Eagle GX|
|Bottom Bracket||SRAM Dub 100|
|Rear Derailleur||SRAM Eagle GX|
|Rear Cogs||GX 12spd 10-50t|
|Shifters||SRAM Eagle GX1|
|Handlebars||Borealis Carbon SL|
|Brake Levers||SRAM Guide RS G2|
|Brakes||SRAM Guide RS G2. Rotors: Avid Centerline 180/160|
|Seat Post||Borealis Carbon|
|Seat Binder||Borealis Alloy|
|Accessories & Extras||Downtube and Chainstay Protectors|
* Subject to change without notice.
Getting FAT | A Fat Biking Story
6 years ago, Dave Ochs, John Norton, and Steve Kaczmarek helped found the Borealis Fatbike World Championships. Today, it's in its 5th year with over 750 riders having participated in the elite division and over 1,400 competitors in all of the various races during worlds. This is that story.
|Medium||GCEAGLE GXR MD||BIFB0039001|
|Large||GCEAGLE GXR LG||BIFB0039002|
|X-Large||GCEAGLE GXR XL||BIFB0039003|