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Borealis Crestone Eagle 12 speed - Large

Borealis Crestone Eagle 12 speed - Large
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Details

Since 2013, Borealis has specialized in lightweight carbon fiber fat bikes. The tried and true Crestone is our flagship model, weighing only 25 pounds with standard options. 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.


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Highlights:



  • Traditional fat bike frame geometry is both responsive and nimble for variable conditions in snow or sand.

  • Standard features include: Eagle NX 12-Speed drivetrain, rigid carbon fork, carbon handlebars, carbon seat post, lightweight HED Alloy wheelset and internally routed cables.

  • Tire clearance up to 26x5”

  • Compatibility for 100-120mm of suspension travel for more technical riding.

  • Lightweight, durable carbon fiber frame comes with 3 bottle cage mounts and lizard skin protectors on both the down tube and drive-side chain stay.


Eagle NX Eagle GX Eagle XO Eagle XX
Crankset SRAM Eagle NX SRAM Eagle GX SRAM Eagle XO SRAM Eagle XX
Crank Arms 175mm Alloy 175 Alloy 175mm Carbon 175 Carbon
Rear Derailleur RD ENX 1 x 12 RD EGX 1 x 12 RD EXO 1 x 12 RD EXX 1 x 12
Chain KMC X12 KMC X12 KMC X12 SRAM X12 Gold
Cassette PG 1230 11-50 XG 1275 10-50 XG 1295 10-50 XG 1299 10-50 Gold
Shifters SRAM ENX SRAM EGX SRAM EXO SRAM EXX
Brakes SRAM - Select SRAM - Select SRAM - Select SRAM - Select
Chain Ring 30 Tooth
Frame Borealis Crestone Carbon
Fork Borealis Carbon Rigid Fork or RL Bluto, Mastodon Pro Ext.
Headset Borealis
Hubs Borealis: Front 15×150 Rear 12×197
Rims Your Choice
Spokes Wheelsmith Black
Nipples Wheelsmith Silver Brass
Tires Your Choice
Bar Borealis Carbon Bar 35mm
Stem Borealis 50mm or 70mm
Post Borealis Carbon Seatpost
Saddle Borealis
Grips Ergon GA30 or Ergon GP 10L
Bottom Bracket SRAM DUB 100mm
DT/CS Protector Lizard Skins
Weight See weight calculator for exact weight.

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.

MeasurementsSMLXLSMLXL
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

Videos

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.

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