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Borealis Bikes
Yampa XX1 Complete Bike

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Northern heavy.

While Borealis Bikes aren't exactly what we'd call light, the manufacturer's suggestive name is impossible to resist playing on. So we'll call the Yampa XX1 Complete Bike a northern heavy and call it good on the pun front. The inclusion of SRAM's flagship XX1 drivetrain means "heavy" doesn't translate to "slow" — just "fat." And in this case, "fat" means "ride virtually anywhere, on any surface, at any time of year."


The Yampa's frame is carbon fiber, which will only seem like an unnecessary luxury until you're stomping through boggy mud or snow-covered trails and every watt spent fighting frame weight and flex is one fewer directed into the trail. With an XC-worthy 1,270g of claimed weight, the frame itself isn't exactly a Clydesdale. The oversized chainstays certainly live up to the fat designation, though, with their girth contributing to efficient power transfer. The anorexic seatstays are decidedly not fat, which adds a bit of mechanical compliance to complement the Yampa's plush Surly tires and carbon's natural damping tendencies.


The Yampa's almost-comical 4.8in tire clearance warrants some pretty big hubs (190mm in the rear), so Borealis took matters into its own hands by building them itself. The fork is also Borealis, combining carbon fiber and a 15x135mm thru axle to take advantage of the frame's tapered head tube for stiff efficiency and confident tracking through muck. Despite its enthusiasm to apparently dabble in every aspect of its bikes, Borealis does finally yield the stage for rims (Surly), the cockpit (TruVativ and WTB), and the drivetrain (SRAM's revolutionary XX1).


Details

  • Carbon fiber fat bike frame tips the scales at an XC-friendly 1,270 claimed grams
  • SRAM's XX1 makes for pro-tier, bombproof shifting for all your four-season adventures
  • Surly rims and tires make for a cushy, debris-clearing ride
  • Comically large maximum tire clearance of 4.8in
  • Item #BOR0002
Frame Material
carbon fiber
Fork
Borealis FF1
Headset
Borealis
Shifters
SRAM XX1 11-speed
Rear Derailleur
SRAM XX1 11-speed
Crankset
Race Face Turbine
Bottom Bracket
Truvativ (100mm)
Cassette
SRAM XX1 11-speed
Chain
SRAM PC XX1
Rotors
160 mm SRAM XX
Handlebar
TruVativ Stylo Carbon T40
Grips
Ergon GX-1
Stem
TruVativ Stylo T20
Saddle
WTB Rocket V
Seatpost
TruVativ Stylo Carbon T40
Seat Collar
Borealis
Hubs
Borealis
Tires
Surly Knard
Tire Size
26 in / 3.8 in
Recommended Use
sand, snow

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