2022 Borealis Flume

Specs, Comparisons, Reviews, Galleries


  • 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 increased comfort and control.
  • Lightweight, 6000-series aluminum frame comes with 2-3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chain stay.


  • 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 4.8”
Silver 2022 Borealis Flume fat bike

Key Specs

Specifications for the Borealis Flume that are the most important to picking a mountain bike.
Specs Flume Eagle
Price (USD)2325
Rear Travel (mm)0
Front Travel (mm)0
Head Tube Angle70
Seat Tube Angle73
Wheel Size (in)26
Max Tire Width (in)29x3, 27.5x5 26x5
Component GroupNX
Frame MaterialAlloy
Weight (kgs)12.96
Components for each model of the Borealis Flume comes with.
ComponentFlume Eagle
ForkBorealis Rigid Carbon
TiresSchwalbe Jumbo Jim 26 x 4.8"
WheelsetHubs: Borealis; Rims: MuleFut 26 x 80mm
BrakesSRAM Level T
RotorsF: - R: -
HandlebarsBorealis Carbon, 35mm diameter
Shift LeversSRAM NX
SeatpostBorealis Rigid Carbon
Bottom BracketSRAM DUB 100mm
CassetteSRAM Eagle NX PG 1230 11-50
ChainKMC X12
CranksetSRAM Eagle NX Alloy, 30t, 175mm
Rear DerailleurSRAM Eagle NX
Geometry numbers for each Borealis Flume, the fit, feel, & handling.
Geometry Flume Eagle
Crank Length (mm)175
Stem Length (mm)50
Reach (mm)423
Top Tube Length (mm)610
Stack (mm)610.9
Chainstay Length (mm)455
BB Drop (mm)60
Head Tube Angle (degrees)70
Seat Tube Angle (degrees)73
Head Tube Length (mm)120