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Borealis Bikes
Echo X01 Complete Fat Bike - 2016

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Ride the fat revolution.

We were skeptical when we first heard about suspension forks for fat bikes, but the Borealis Echo X01 Complete Fat Bike quickly changed our minds. The Echo was built as a perfect partner to the RockShox Bluto suspension fork, and saying it adds even more fun to the equation doesn’t really do it justice. It’s a perfect pairing with SRAM’s X01 one-by-eleven groupset. The proven setup is light, reliable, and versatile. But be forewarned, your other bikes are about to get ridden way less than they’re used to.

Borealis built the Echo frame by pairing cutting-edge carbon fiber construction methods with geometry that’s been optimized for the RockShox Bluto — the world’s first dedicated fat bike suspension fork. Beyond shedding grams, the composite construction has enabled Borealis to finely tune the ride quality, resulting in a strong frame that will hold up to heavy use. That’s particularly important, since the addition of the 100mm travel Bluto invites even more aggressive riding than the already surprisingly capable Yampa.

The profiling of the seatstays enables a degree of vertical compliance, while the oversized chainstays keep the pedaling responsive when you stomp on the gas. Like the Yampa, the Echo clears massive 4.8-inch tires on a 100mm wide rim. To achieve that degree of clearance, Borealis has relied on another industry first, namely a 197mm spaced rear hub, which is secured by a Maxle quick-release thru axle. The result is a dishless rear wheel, a surprisingly stiff rear end, and perfect drivetrain alignment with the 100mm threaded bottom bracket shell. Additionally, it provides enough clearance for a one or two-by drivetrain, regardless of your tire choice. Naturally, there's plenty of extra clearance for mud, snow, or anything else you're likely to find yourself riding through. The head tube is tapered, which takes advantage of the incredible stiffness provided by the Bluto. It's equipped with three bottle cage mounts, to keep you hydrated for long hours in the saddle. And at 1370 grams for a medium frame, it’s far lighter than it appears.

Of course, the Echo frame is mated to a RockShox Bluto suspension fork. SRAM's X01 one-by-eleven drivetrain got the nod for the X01 build. The crankset is a Race Face Turbine setup, with 32t narrow-wide chainring for flawless chain retention without the need for a chainguide. SRAM X0 brakes handle stopping duties, and the cockpit is primarily Race Face Turbine hardware with a WTB saddle. The wheels are Borealis' own hubset, featuring a 197mm quick-release thru axle out back, and a 135mm 15mm quick-release thru-axle front hub. They're laced with stainless spokes to Turnagain FR80 rims, wrapped in 4-inch wide 45 North Husker Du tires, for a versatile, reliable setup.

The Borealis Echo X01 Complete Fat Bike is available in four sizes, from Small to X-Large, and in the colors Black and Black/blue.


  • Full carbon fiber frame and fork with three water bottle mounts
  • RockShox Bluto suspension fork
  • Surly rims laced to Borealis hubs and wrapped in 45NRTH’s Husker Du tires
  • Item #BOR000A
Frame Material
carbon fiber
RockShox Bluto
Front Travel
100 mm
SRAM X01 11-speed
Front Derailleur
Rear Derailleur
SRAM X01 11-Speed Type 2
32 t Race Face Turbine
Bottom Bracket
Race Face
10-42 t SRAM X01 XG-1195
160 mm SRAM
Race Face Turbine 35
Handlebar Width
760 mm
Lizard Skin Peaty lock on
Race Face Turbine 35mm
Stem Length
70 mm
WTB Pure V Race
Race Face Turbine
Seat Collar
Borealis FH150
45N Husker Du
Tire Size
26 in x 4 in
not included
Claimed Weight
[frame, medium] 1370 g
Recommended Use
sand, snow