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
I would highly recommend anybody looking for a Fat Bike, this is the bike! I chose to assemble it myself and the quality of this bike is outstanding. You cannot beat the value for what is included with a Borealis Fat Bike.
Feels so comfortable and very light! Love the gx groupset and the video to get it set up was helpful! Could have gone a little slower but I just paused when I needed! The color is actually so neat, went with the midnight blue. Looks black, dark blue, and purple in different lighting!
I custom built my Crestone and received it within about a week. IT IS AWESOME! I have a gravel bike and a hard tail 29er that I ride a lot. As much as I like those bikes, my Crestone is now by far my favorite! The single track is covered in leaves this time of year. I fly through the trail with confidence and no slippage. It is lightweight, has great components, and outstanding ergonomics. Stop looking. Buy one!
Can't wait for snow! For now I'm crushing front range singletrack and it really comes down to weight of the bike. It is 26lbs with 7lb YKY tires. 26lbs and 14lbs is just tires! They roll. They grip. The bike has a great geo and can climb. Out of the saddle I'm hammering climbs. Doesn't like to get airborne is the only thing I can think of, but hey - buy something else for that. I'm locked in now. Love this bike
I had never built a bike from just a bare frame before so I thought I'd give it a try. Thankfully you can learn anything from Youtube! Had one question for the guys at Borealis and they got right back to me with an answer. I was very happy with the customer service and the deal I got on the bike was awesome.