$1,499.00
FLUME FRAME
15% OFF COMPLETE BIKES & FRAMES - ENDS 4/30. Discount applied in cart.
0% APR up to 24 months with Affirm! Financing Options Available at Checkout.
Size Chart
Size Chart
Shipping and Returns
Shipping and Returns
PO boxes not accepted.Shipping discounts or exclusions only apply within the lower 48 states of the US. Contact us if damage occurs during shipping.
Borealis offers a 30-day money-back guarantee. If you are unsatisfied with your purchase for any reason, you can exchange your product or return it for a full refund minus any associated transaction fees and shipping costs. Customer is responsible for return shipping costs. Returned and exchanged items must be in sellable condition.
LIMITED LIFETIME WARRANTY
LIMITED LIFETIME WARRANTY
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The Borealis Flume offers the best fat bike 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.
HIGHLIGHTS
- Traditional fat bike geometry is both responsive and nimble for variable conditions in snow or sand.
- Standard features include: Eagle NX 12-Speed drivetrain, rigid carbon fork, carbon handlebars, carbon seat post and durable Sun-Ringle Mulefut rims.
- 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 3 bottle cage mounts, rear rack mounts on seat stays and Lizard Skin protectors on both the down tube and drive-side chain stay.
- Available in two colorways
- Reduced stand over height
Frames include:
- Chainstay and seatstay protectors
- Seatpost collar
- Rear axle
- Derailleur hanger
Frame with Fork includes all of the above as well as:
- Fork of your choice
- Complete headset assembly with compression plug / star nut
- Front axle
All frames are covered by a LIFETIME warranty and crash replacement program.
| Wheel / Tire Size | 26 x 3.8–5.0" on up to a 100mm rim / 27.5 x 2.8-4.5 on up to a 82mm rim / 29 x 2.25–3.0 |
| Susp Fork Travel | 100-120mm |
| Fork Offset | 51mm |
| Headset-Upper | IS41 |
| Headset-Lower | IS52 |
| Seatpost | ø31.6mm |
| Seat Collar | ø34.9mm |
| Dropper Compatible | Internal - 125mm for SM & MD / 150mm for LG & XL |
| Front Derailleur Type | Not Compatible |
| Bottom Bracket | 100mm Threaded BSA |
| Crankset (Max Ring) | Chainline 76mm / 1x (34t) |
| Rear Brake (Rotor) | 74mm post (160–180mm) |
| Rear Spacing | 197 x 12mm thru-axle |
| Rear Axle | ø12 x 229L, TP= 1.5, TL = 20 |
| Derailleur Hanger | Borealis Custom |
| Bottle Mount | SM : 2 (downtube) / MD, SM, XL: 3 (downtube & seatube) |
| Rear Rack Reccomendation | Old Man Mountain Divide Fat |
| Rear Rack Mounts, Upper | Yes |
| Axle to Crown | 487mm |
| Steerer Tube Size | 28.6mm |
| Steerer Style | Tapered |
| Crown Seat Diameter | 40mm |
| S | M | L | XL | |
| EFFECTIVE TOP TUBE | 585 mm | 610 mm | 630 mm | 650 mm |
| SEAT TUBE CENTER TO TOP | 381 mm | 432 mm | 484 mm | 534 mm |
| HEAD TUBE | 105 mm | 120 mm | 135 mm | 150 mm |
| SEAT TUBE ANGLE | 73 deg | 73 deg | 73 deg | 73 deg |
| HEAD TUBE ANGLE | 70 deg | 70 deg | 70 deg | 70 deg |
| STANDOVER HEIGHT | Varies based on wheel and tire size | |||
| CHAINSTAY | 455 mm | 455 mm | 455 mm | 455 mm |
| BB DROP | 60 mm | 60 mm | 60 mm | 60 mm |
| REACH | 407 mm | 423 mm | 438 mm | 451 mm |
| STACK | 597 mm | 611 mm | 625 mm | 639 mm |
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Customer Reviews
I used the Flume frame as a base for a custom fat bike build. Fit and finish on the frame is very good. Tire clearance is also very good. Once built up, the bike handled very nicely and is super fun! It ended up being 32 lbs with a Rockshox Bluto and an AXS Reverb dropper, which is not too bad for a GX build.