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1150 Blairs Ferry Road NE
Cedar Rapids, IA 52402
Phone: (319) 393-6557
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Borealis Flume

Borealis Flume


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Product Details

2017 Borealis Flume

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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.

Model can be built up with the Borealis Carbon Rigid Fork or Optional Rockshox Bluto fork.


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 componets

  • Available in two colorways.

  • Reduced stand over height.

  • Carbon bar.

  • Carbon seatpost.

  • Carbon fork.

  • Specifications close open

    Specification Description
    Frame Borealis Flume lightweight 6066 alloy frame
    Fork Borealis Carbon Rigid Fork
    Headset Cane Creek 40
    Rims/Wheels Turnagain FR80 Black
    Tires 26×4.0 Hüsker Dü 27tpi
    Crankset Raceface Ride crank 22-36
    Chain KMC X10
    Rear Derailleur SRAM 10s or
    Rear Cogs SRAM 10-36
    Shifters SRAM 2×10 or 1x11
    Handlebars Truvativ T20
    Tape/Grips Ergon GA2
    Stem Race Face Turbine 35 70mm
    Brakes SRAM DB5 w/Centerline 160/160mm rotors
    Saddle Ergon SME30 EVO
    Seat Post Truvativ T20

    * Subject to change without notice.

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  • Part Numbers close open

    Option Manufacturer's Part Number Store SKU
    Black frame with Silver Trim / GX 1x11 / Medium BISP0205 BISP0205
    Black frame with Blue Trim / 2x10 / Large BISP0206 BISP0206
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Northtowne Cycling and Fitness

1150 Blairs Ferry Road NE
Cedar Rapids, IA 52402
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(319) 393-6557

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