Flume GX

MSRP: $2,525.00

$2,525.00

Flume GX

Borealis Fat Bikes works with dealers across the country, find a dealer near you for the best pricing in your area!

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

GX Flume Specs (1×11)

Frame Borealis Flume Lightweight 6066 Alloy Frame (Orange/Black/Green)
Fork Borealis Carbon Rigid Fork or Bluto RL
Headset Borealis
Hubs Borealis. Front 15×150 Rear 12×197 Black
Rims FTD80mm
Spokes Wheelsmith Black
Nipples Wheelsmith Silver Brass
Tires Dealer’s Choice
Bar Borealis Carbon 35mm
Stem Borealis 70mm
Post Borealis Carbon 31.6mm
Saddle Borealis
Grips Ergon GA30
Crankset SRAM GX Alloy w/30T Chain Ring
Rear Derailleur SRAM GX 1×11
Chain KMC X11
Cassette SRAM XG-1150 10-42
Shifters SRAM GX 1×11
Brakes SRAM Level T w/Centerline 160/160mm rotors
DT/CS Protector Lizard Skins
Weight ~26lbs 15oz +2lbs for Bluto

GEOMETRY & SIZING

Borealis offers four frame designs with unique fit and geometry to suit your every Fat Bike need. Begin by taking a rough size approximation on the chart below that is based on height, then select the corresponding bike with your fit needs by using the geometry chart further below. We recommend a similar fit to you mountain bike, so grab a measuring tape and dial it in.

RIDER HEIGHT RECOMMENDATIONS

Based on our research, riders at the heights below will usually take the corresponding frame size. If you’re at a transitional height that spans two sizes, look at the geometry chart to get the Stack and Reach you like based on other bikes you are comfortable

S M L XL S M L XL
Effective Top Tube 23.78 in 24.02 in 24.8 in 25.59 in 604 mm 610 mm 630 mm 650 mm
Seat Tube Center to Top 15 in 17.01 in 19.06 in 21.02 in 381 mm 432 mm 484 mm 534 mm
Head Tube 4.13 in 4.72 in 5.31 in 5.91 in 105 mm 120 mm 135 mm 150 mm
Seat Tube Angle 73 deg 73 deg 73 deg 73 deg 73 deg 73 deg 73 deg 73 deg
Head Tube Angle 70 deg 70 deg 70 deg 70 deg 70 deg 70 deg 70 deg 70 deg
Standover Height Due to various rim and tire options stand over is not identified.
Chainstay 17.91 in 17.91 in 17.91 in 17.91 in 455 mm 455 mm 455 mm 455 mm
BB Drop 2.36 in 2.36 in 2.36 in 2.36 in 60 mm 60 mm 60 mm 60 mm
Reach 16.04 in 16.65 in 17.22 in 17.76 in 407.3 mm 423 mm 437.5 mm 451.2 mm
Stack 23.50 in 24.05 in 24.61 in 25.16 in 597 mm 610.9 mm 625 mm 639.1 mm