HIGHLIGHTS
- 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.
WHEELS & TIRES
- All bikes come standard with tubes.
- If you order rim tape with your Mulefut rims, we will tape the rims and install the tires with tubes.
- HED Alloy and HED Carbon rims do not require rim tape for tubeless set up.
- Tubes must be removed and tubeless valves installed for tubeless set up. We recommended to have this completed by a professional bicycle mechanic.
BUILD SPECS
Eagle NX | Eagle GX | Eagle X01 | Eagle XX | |
Crankset | SRAM Eagle NX | SRAM Eagle GX | SRAM Eagle X01 | SRAM Eagle XX |
Crank Arms | 175mm Alloy | 175 Alloy | 175mm Carbon | 175mm 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 XX |
Cassette | PG 1230 11-50 | XG 1275 10-52 | XG 1295 10-52 | XG 1299 10-50 Gold |
Shifter | SRAM Eagle NX | SRAM Eagle GX | SRAM Eagle X01 | SRAM Eagle XX1 |
Brakes | SRAM - Select | SRAM - Select | SRAM - Select | SRAM - Select |
Chain Ring | SRAM 30T X-Sync | |||
Frame | Borealis Crestone Carbon | |||
Fork | Borealis Carbon Rigid Fork | |||
Headset | FSA | |||
Hubs | Borealis: Front 15×150 Rear 12×197 | |||
Rims | 26" or 27.5" Sun Ringle Mulefut V2 |
|||
Spokes | Borealis Straight Gauge | |||
Nipples | Borealis Silver Brass | |||
Tires | Your Choice | |||
Bar | RaceFace Next SL Carbon 740x10mm OR Borealis Carbon (based on supply) | |||
Stem | Borealis 50mm or 70mm | |||
Post | RaceFace Next SL Carbon 31.6 | |||
Saddle | Borealis | |||
Grips | Borealis | |||
Bottom Bracket | SRAM DUB 100mm | |||
DT/CS Protector | Lizard Skins | |||
Weight | See weight calculator for estimated weight. |
GEOMETRY CHART
Stack and Reach are the fundamental fit elements, they are both measured relative to the bottom bracket. When choosing the Borealis that is right for you, it’s important to find a balance in these measurements to ensure the best performance.
S | M | L | XL | |
EFFECTIVE TOP TUBE | 585 mm | 610 mm | 630 mm | 650 mm |
SEAT TUBE CENTER TO TOP | 381 mm | 432 mm | 484 mm | 534 mm |
HEAD TUBE | 105 mm | 120 mm | 135 mm | 150 mm |
SEAT TUBE ANGLE | 73 deg | 73 deg | 73 deg | 73 deg |
HEAD TUBE ANGLE | 70 deg | 70 deg | 70 deg | 70 deg |
STANDOVER HEIGHT | Varies based on wheel and tire size | |||
CHAINSTAY | 459 mm | 459 mm | 459 mm | 459 mm |
BB DROP | 60 mm | 60 mm | 60 mm | 60 mm |
REACH | 407 mm | 423 mm | 438 mm | 451 mm |
STACK | 597 mm | 611 mm | 625 mm | 639 mm |
ASSEMBLY
If you choose "No Assembly" your bike will require complete assembly with an exception of the wheels.
If you choose "Assembled by Borealis", there is some assembly required upon receipt. Your bike will be completely assembled and tuned by Borealis, then partially disassembled for shipment. The remaining assembly will require installation of the rear derailleur, chain, fork, seat post, wheels, and handlebars. A multi-tool will be included with your order that has all tools necessary to assemble the bike, with the exception of a torque wrench. If you are not familiar with this level of assembly, we recommend having your local bike shop complete the assembly. Below is a video showing the remaining assembly once you receive the bike.
OWNER'S MANUAL
COMPATIBILITY
- 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”





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Customer Reviews
great service, delivered really fast and the bike is great...cant wait till it snows...bring on the groomed single track!
Was thinking of upgrading my old, heavy fat bike and found a Crestone Demo on the Borealis website. So, I called and spoke with David, who was super friendly and helpful and gave me lots of details about the bike itself and the demo purchase process. He even went out to physically check on the two bikes I was interested in, and called me back 10 mins later with details about their exact condition (near perfect!).
So, I placed my order online around lunchtime on a Friday, and my bike shipped that evening and arrived by the following Tuesday!! I assembled it in about an hour using only the free multi-tool they provided, then was able to dial-in the fit and tuning during a short ride around my house.
The bike itself (Crestone) is exactly as described, and is clearly built with great attention to detail. It's as light as my short-travel XC race bike, but way more stable and with much better traction!
This particular demo bike was set up with tubes, and when I asked about going tubeless, David made sure to include valves and sealant at no extra charge. The free t-shirt and tote bag were a nice touch, too!
I'm totally impressed by both Borealis as a company and the quality of the bike.
CRESTONE EAGLE 12 speed