FEATURES
The Flume Select provides unparalleled value for a fat tire bike. Perfect for riding in snow, sand, gravel, and everything in between. This fat bike combines our durable Aluminum Frame with our basic component build. Standard features include, Borealis Rigid Carbon Fork, SRAM Eagle NX 12-speed drivetrain, SRAM Level T Hydraulic Disc Brakes, SunRingle Mulefut 27.5" wheels and Maxxis Minion FBF/FBR 3.8" tires.
BUILD SPECS
| Frame | Flume (Aluminum) |
| Fork | Borealis Rigid Carbon 51mm Offset |
| Bottom Bracket | SRAM DUB Threaded 100mm |
| Crankset | SRAM Eagle NX Alloy 175mm w/ SRAM X-SYNC 30T |
| Rear Derailleur | SRAM Eagle NX 12-Speed |
| Chain | SRAM EAGLE GX |
| Cassette | SRAM PG-1230 11-50T |
| Shifter | SRAM Eagle NX 12-Speed |
| Brakes | SRAM Level T 2-Piston Hydraulic with SRAM Centerline 160mm Rotors |
| Headset | FSA |
| Hubs | Borealis GEN 4 Black 15x150 Front / 12x197 Rear |
| Rims | Sun Ringle Mulefut V2 27.5x65 |
| Spokes | Borealis Straight Gauge |
| Nipples | Borealis Silver Brass |
| Tires | Maxxis Minion FBF/FBR 27.5x3.8 |
| Bar | RaceFace NEXT SL 740x10mm OR Borealis Carbon (based on supply) |
| Stem | Borealis 50mm x 35mm |
| Post | Borealis Carbon 31.6x400 |
| Saddle | Borealis |
| Grips | Borealis |
| DT/CS Protector | Lizard Skins |
| Estimated Weight | Size Medium 30lb |
FRAME SPECS
| 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 an 82mm rim / 29 x 2.25–3.0 |
| Max Fork Travel | 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 | Yes |
| Bottom Bracket | 100mm Threaded BSA |
| Crankset (Max Ring) | Chainline 76.5mm / 1x (34t) |
| Rear Brake (Rotor) | 74mm post (160mm) |
| Rear Spacing | 197 x 12mm thru-axle |
| Rear Axle | ø12 x 229L, TP= 1.5, TL = 20 |
| Derailleur Hanger | Borealis Flume |
| Bottle Mount | Small & Medium: 1 (downtube) / Large & XL: 2 (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 |
GEOMETRY CHART
Stack and Reach are the fundamental fit elements, they are both measured relative to the bottom bracket. When choosing the Borealis that is right for you, it’s important to find a balance in these measurements to ensure the best performance.
| 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 |
| 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 |
ASSEMBLY
There is some assembly required upon receipt. Your bike will be completely assembled and tuned by Borealis, then partially disassembled for shipment. The remaining assembly will require installation of the rear derailleur, chain, fork, seat post, wheels, and handlebars. A multi-tool will be included with your order that has all tools necessary to assemble the bike, with the exception of a torque wrench. If you are not familiar with this level of assembly, we recommend having your local bike shop complete the assembly. Below is a video showing the remaining assembly once you receive the bike. Tires will be set up with tubes. Tubeless rim tape and valves are included on the side.
Shipping and Returns
Borealis does not accept shipments to PO boxes, and additional charges may apply for deliveries to Alaska and Hawaii. We offer flat rate shipping on all products through the most economical FedEx option.
Bikes, frames, and wheelsets typically ship via Ground, while small parts are shipped using 2-Day Express. Please contact us if any damage occurs during shipping.
Borealis provides a 30-day money-back guarantee. If you're not satisfied with your purchase, you can exchange the product or return it for a full refund, minus any transaction fees and shipping costs. Return shipping is the customer’s responsibility, and all returned or exchanged items must be in sellable condition.
LIMITED LIFETIME WARRANTY ON BICYCLE FRAMES & FORKS
Normal Conditions
The limited warranty is conditioned upon the bicycle being operated under normal conditions and use, and properly maintained.
Limitations
This limited warranty does not apply to paint/finish or components attached to the bicycle/fork/frameset such as rims, drive train, brakes, seat post, handlebar and stem, or any suspension related parts or components.
Paint/finish, components attached to the bicycle/frameset such as rims, drive train, brakes, seat post, handlebar and stem, or any suspension-related parts or components are covered under the limited one (1) year warranty.
Load Weight
The total cargo load for BOREALIS frames and forks is 300 pounds. The total cargo load includes the rider and any associated gear warn by the rider or attached to the frame or fork.
