The Flume Elite is the pinnacle of aluminum adventure ready fat tire bikes, perfect for long adventurous rides in snow, sand, or gravel. A size medium weighs in around 28 pounds! Standard features include Borealis Rigid Carbon Fork, SRAM Eagle X01 12-speed drivetrain, HED Aluminum 27.5" wheels, and Terrene Cake Eater 4.0" tires.
Frame | Borealis Flume Aluminum |
Fork | Borealis Carbon Rigid Fork |
Bottom Bracket | SRAM DUB Threaded 100mm |
Crankset | SRAM Eagle X01 Carbon 175mm with SRAM 30T X-Sync chainring |
Rear Derailleur | SRAM Eagle X01 12 speed |
Chain | SRAM GX |
Cassette | SRAM XG-1295 10-50T |
Shifter | SRAM Eagle X01 12 speed |
Brakes | SRAM G2 RS 4-Piston Hydraulic with SRAM Centerline 160mm Rotors |
Headset | FSA |
Hubs | Velocity Fat Disc |
Rims | HED Alloy BHD 27.5x80 |
Spokes | Borealis Straight Gauge |
Nipples | Borealis Silver Brass |
Tires | Terrene Cake Eater 27.5x4.0" Light 120TPI |
Bar | RaceFace NEXT SL 740x10mm OR Borealis Carbon (based on supply) |
Stem | Borealis 50mm |
Post | RaceFace Next SL 31.6x400 |
Saddle | Borealis |
Grips | Ergon GA20 |
DT/CS Protector | Lizard Skins |
Estimated Weight | Size Medium 28lb |
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.
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