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  • Borealis Fat Bikes Flume/LG/CrimGold/EGX/LvlT/Mulfut27.5x80/Colosuss 4.5

Flume/LG/CrimGold/EGX/LvlT/Mulfut27.5x80/Colosuss 4.5

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Groupset: SRAM Eagle GX 12 Speed

Brakes: SRAM Level T

Rims: Mulefut 27.5X80

Seat Post: Rigid Carbon

Fork: Borealis Rigid Carbon

Hubs: Borealis

Tires: Maxxis Colossus 27.5x4.5


  • 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”
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