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Borealis Flume - Large Custom Build

Borealis Flume - Large Custom Build
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With premium frame quality and only the best components, the Borealis Flume offers the best 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.

*Eligible for pickup*

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.


Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5”


Frame Borealis Carbon
Fork Borealis Carbon
Hubs Borealis: Front 15×150 Rear 12×197
Tires Schwalbe
Crankset Sram NX
Rear Derailleur Sram NX
Rear Cogs Sram NX
Brakes Sram G2

* Subject to change without notice.


Borealis Fat Bikes