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Borealis Flume Eagle NX

Borealis Flume Eagle NX
  • Color: Seafoam Green
  • Color: Metallic Crimson Red & Gold
  • Color: Metallic Crimson Red & Gold
$1,690.00 - $1,950.00
Please select options


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.

Standard features include:
- SRAM NX 12-Speed drivetrain
- SRAM Level T brakes
- Carbon handlebars
- Carbon seat post
- Sun Ringle Mulefut 26" x 80 mm wheelset
- 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
- 2-3 bottle cage mounts
- Lizard skin protectors on both the down tube and drive-side chain stay.

- Frame: Borealis Flume Alloy
- Rear Derailleur: SRAM NX Eagle 1 x 12spd
- Shifter: SRAM Eagle NX 12spd Trigger Shifter
- Chain: KMC 12 speed, silver
- Crankset: SRAM Eagle DUB NX Crank, 30T Ring
- Cassette: SRAM Eagle NX 12spd Cassette 10-50T
- Rims/Wheelset: Sun Ringle Mulefut 26" x 80 mm
- Hubs: Velocity - Front 15×150, Rear 12×197
- Tires: Terrene Cake Eater 26" x 4.0
- Fork: Carbon
- Brakes: SRAM Level T
- Headset: Borealis
- Stem: Borealis 50mm
- Handlebar: Borealis Carbon SL
- Seatpost: Borealis Carbon Seat Post, 31.6
- Saddle: Borealis Saddle
- Grips: Standard, Black

- Rockshox Bluto Fork tire size limitations: 26x5” or 27.5x4”
- Mastodon Pro EXT Fork tire size limitations: 26x5” or 27.5x4.5”
- Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5”
- Dually 29x45 and 27.5x45 Rims – Max tire width: 3”
- All rims 65mm to 85mm wide are compatible with tire widths of 3.8” to 5”
- HED Carbon 100mm Rims – Max tire width of 4.6”

* Subject to change without notice.

Part Numbers

Option MPN Store SKU
Seafoam Green / Large Flume-L-NX 210000082635
Seafoam Green / X-Large Flume-XL-NX 210000082636
Metallic Crimson Red & Gold / Small 210000085632 210000085632