Skip to main content

Borealis Telluride Eagle 12 speed

Borealis Telluride Eagle 12 speed
$1,841.00 - $5,454.00
Please select options
Sorry, this item is currently not in stock. Please call (319) 393-6557 or email us for availability.
We do not ship this item, however it can be reserved online and picked up at your convenience in our store. You will be notified as soon as your order is ready for pickup.


Custom Design Your Own Fat Bike

The goal was simple: Design a fat bike that can attack every trail, all year long. The Borealis Telluride is designed and equipped with single-track riding in mind, allowing riders to push the limits with their fat bikes. Its frame geometry is optimized for 3-4" wide tires in both 29" and 27.5" diameter. A slacker head tube angle and longer wheelbase give riders a more controlled and planted ride. Paired with the highest quality components available, the Telluride is up for every trail in every season.

  1. Visit Borealis Fat Bikes

  2. Configure your bike

  3. Let Northtowne Cycling & Fitness help you build yours today.


  • This one bike quiver can be set up for all season use, both in snow during the winter and on single-track during the warmer months.

  • Standard features include: Eagle NX 12 Speed drivetrain, RaceFace Next R Carbon Crankset, rigid carbon fork, carbon handlebars, dropper post, and 160mm rotors.

  • Optimized for both 27.5 and 29 inch wheels and accommodates up to 4 inch wide tires.

  • Slacker head tube angle and compatibility for up to 120mm of suspension travel for more controlled descents.

  • Longer wheelbase for increased stability and angled top tube for comfortable stand over.

  • 83mm bottom bracket reduces the Q-factor down to 189mm.

  • Lightweight 6000-series aluminum frame is durable and includes rack mounts. Telluride aesthetics are classic with smooth finish welds and externally routed cables.

  • All complete bikes come with two tubes.

Eagle NX Eagle GX Eagle XO Eagle XX
Crankset RaceFace Next R
RaceFace Next R
RaceFace Next R
RaceFace Next R
Crank Arms 175mm Carbon 175 Carbon 175mm Carbon 175 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 Gold
Cassette PG 1230 11-50 XG 1275 10-50 XG 1295 10-50 XG 1299 10-50 Gold
Brakes SRAM - Select SRAM - Select SRAM - Select SRAM - Select
Chain Ring 30 Tooth
Frame Borealis Telluride Alloy
Fork Rigid Carbon Fork Standard
Headset Borealis
Hubs Borealis: Front 15×150 Rear 12×177
Rims Your Choice
Spokes Wheelsmith Black
Nipples Wheelsmith Silver Brass
Tires Your Choice
Bar Borealis Carbon Bar 35mm
Stem Borealis 50mm or 70mm
Post Dropper Post Standard (125mm or 150mm)
Saddle Borealis
Grips Ergon GA30 or Ergon GP 10L
Bottom Bracket RaceFace
DT/CS Protector Lizard Skins
Weight See weight calculator for exact weight.

Based on our research, riders at the heights below will usually take the corresponding frame size. If you’re at a transitional height that spans two sizes, look at the geometry chart to get the Stack and Reach you like based on other bikes you are comfortable.

Borealis offers four frame designs with unique fit and geometry to suit your every Fat Bike need. Begin by taking a rough size approximation on the chart below that is based on height, then select the corresponding bike with your fit needs by using the geometry chart further below. We recommend a similar fit to you mountain bike, so grab a measuring tape and dial it in.

EFFECTIVE TOP TUBE 23.02 in 24.02 in 24.8 in 25.59 in 585 mm 610 mm 630 mm 650 mm
SEAT TUBE CENTER TO TOP 15 in 17.01 in 19.06 in 21.02 in 381 mm 432 mm 484 mm 534 mm
HEAD TUBE 4.13 in 4.72 in 5.31 in 5.91 in 105 mm 120 mm 135 mm 150 mm
SEAT TUBE ANGLE 73 deg 73 deg 73 deg 73 deg 73 deg 73 deg 73 deg 73 deg
HEAD TUBE ANGLE 70 deg 70 deg 70 deg 70 deg 70 deg 70 deg 70 deg 70 deg
STANDOVER HEIGHT Due to various rim and tire options stand over is not identified.
CHAINSTAY 17.91 in 17.91 in 17.91 in 17.91 in 455 mm 455 mm 455 mm 455 mm
BB DROP 2.36 in 2.36 in 2.36 in 2.36 in 60 mm 60 mm 60 mm 60 mm
REACH 16.04 in 16.65 in 17.22 in 17.76 in 407.3 mm 423 mm 437.5 mm 451.2 mm
STACK 23.50 in 24.05 in 24.61 in 25.16 in 597 mm 610.9 mm 625 mm 639.1 mm


Getting FAT | A Fat Biking Story

6 years ago, Dave Ochs, John Norton, and Steve Kaczmarek helped found the Borealis Fatbike World Championships. Today, it's in its 5th year with over 750 riders having participated in the elite division and over 1,400 competitors in all of the various races during worlds. This is that story.