Borealis Flume Fat Tire Bicycle

Borealis Flume Fat Tire Bicycle

Borealis Bikes

  • $ 2,400.00
    Unit price per 
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Only 1 left!

08/20 - Please Call for Current Availability. Due to shortages, may take 2-3 weeks to build.



The Borealis Flume offers the best fat bike value on the market. This expedition-ready fatty mirrors the Crestone geometry, but does so in lightweight, 6000-series aluminum. Up mountains, down glaciers, and across deserts - the Flume is ready for action. There are all kinds of alloy fat bikes on the market, but none with the Flume’s purebred heritage and durability.


Traditional fat bike geometry is both responsive and nimble for variable conditions in snow or sand.
Standard features include: Eagle NX 12-Speed drivetrain, rigid carbon fork, carbon handlebars, carbon seat post and durable Sun-Ringle Mulefut rims.
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 3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chain stay.
Available in two colorways
Reduced stand over height


Please see geometry charts on build page for sizing details. All sales are final, no returns. All frames are covered by a 5 year warranty and crash replacement program.