Borealis Flume NX

Borealis Flume NX
  • Color: Orange/Black
This item is currently not available.


Fatbiking adventurers know that inspiration matters and a ride (or bike) is only as good as the idea that created it. The expedition-ready Flume capitalizes on all the sweetness of the Crestone, 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. The custom tubeset mates ideal, high-performance geometry with competition-ready spec. But if pedaling across our blue planet is more your speed, the Flume will speed you through.

The Flume is built on an alloy frame that draws on all of our experience in making fat bikes at a much lower price.

  • All aluminum frame with careful attention to finish details
  • Borealis unique geometry for the best ride experience
  • SRAM GX components
  • Available in two colorways
  • Reduced stand over height
  • Carbon bar & seatpost
  • Carbon fork


Frame Borealis Flume Lightweight 6066 Alloy Frame (Orange/Black/Green)
Fork Borealis Carbon Rigid Fork or Bluto RL (+$200)
Headset Borealis
Rims/Wheels Borealis FTD 65mm, FTD 80mm, or FR80
Hubs Borealis. Front 15×150 Rear 12×197 Black
Spokes Wheelsmith Black
Tires Husker Du or Knard 27TPI
Crankset SRAM Eagle GX Alloy w/30T Chain Ring
Chain SRAM NX11
Rear Cogs SRAM PG 1130 11-42
Shifters SRAM NX 1×11
Brakes SRAM Level T w/Centerline 160/160mm Rotors
Saddle Borealis
Seat Post Borealis Carbon 31.6mm
Accessories & Extras Lizard Skins
Color(s) Orange/Black/Green
Sizes S, M, L, XL
Weight ~26lbs 15oz +2lbs for Bluto

* Subject to change without notice.

Part Numbers

Option MPN
Orange/Black / Medium GFLNXRIGIDPHFLR
Orange/Black / Large GFLNXRIGIDPHFLR