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Yampa X0/X9 Complete Bike

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Not just a snow bike.

The crew at Borealis is adamant — fat bikes are for year-round use, on all kinds of trails and conditions. Having ridden them in both winter and summer, atop snow and desert sand and rock, we’d have to agree. The traction and flotation you get from a 4-inch tire just can’t be matched. And paired with Borealis’ carbon fiber design, it’s a high-performing, fast, and agile traction machine.


Up first need to be the axle standards — if you thought mountain bike axles and bottom brackets are a sea of ever-changing "standards," you ain’t seen nothing yet. The Borealis Yampa has a 197mm rear hub, which’ll build up a dishless rear wheel, and a 135mm front hub, with a 10mm bottom bracket shell sitting in between. The reason for these three standards is pretty simple — strength, tire clearance, and chain clearance. We mentioned the dishless rear wheel, but the Yampa will clear a 4.8in tire on a 100mm rim, and to do that, the crankset needs to be offset a bit to the outside, thus the 100mm BB.


The build is rounded out with SRAM’s X0 and X9 components, BB7 mechanical discs, a Race Face crankset, and Truvativ cockpit. The wheels start with Borealis’ own hubs, which are laced to Surly Turnagain rims, which have Surly Knards mounted to them.


Details

  • Full carbon frame
  • Full carbon fork
  • Three water bottle cage mounts
  • 197mm rear spacing
  • 135mm front spacing with 15mm thru-axle
  • SRAM drivetrain
  • Surly rims and tires laced to Borealis hubs
  • Clearance for 4.8in tires on 100mm rims
  • Item #BOR0001
Frame Material
carbon fiber
Fork
Borealis FF1
Headset
Borealis
Shifters
SRAM X.9
Front Derailleur
SRAM X.9 (double)
Rear Derailleur
SRAM X.0
Crankset
22 / 36 t Race Face Ride
Bottom Bracket
100mm BB shell
Cassette
SRAM PG-1070
Chain
SRAM PC-1051
Rotors
160 mm Avid
Handlebar
TruVativ Stylo T20
Grips
standard
Stem
TruVativ Stylo T20
Saddle
WTB Rocket V
Seatpost
TruVativ Stylo T20
Seat Collar
Borealis
Hubs
Borealis
Front Axle
15mm thru-axle
Rear Axle
197mm thru-axle
Tires
Surly Knards
Tire Size
3.8 in
Recommended Use
sand, snow