Over two years in the making. Thoughtfully designed for speed, agility, and beauty. Painstakingly tested and refined on the iconic singletrack in our own backyard. Made entirely here in the United States, by us, with unparalleled precision and passion. Inspired by the legendary Back 40 trail system. Meet the new BC40, a thoughtfully engineered modern cross-country machine, mixed with an all-day trail sled. A plush 120mm of front and rear travel combined with a second-to-none pedaling platform and progressive geometry delivers precise speed, handling, and tracking for the needs of the modern trail shredder.
- In-house development and testing, including building our own testing methodology and machines, and tearing apart our competitors' bikes to weigh every part and benchmark performance.
- Designed to stretch the capability of what a cross-country bike can do while making no compromises with weight and pedaling efficiency.
- Every piece of carbon is meticulously cut, stacked, formed, and molded to hit the highest possible quality standard.
- Aluminum suspension linkage and floating brake mount machined in-house to ensure the highest precision for fitment and alignment.
- Built to exceed the expectations of multi-time Olympians and national champions, for ultimate performance at the highest level of competition.
- Inspired by decades of riding and racing, and purpose-built for the hundreds of miles of trails in our backyard.
Key Features
- FRAMESET WEIGHT
- 1950 grams (Lrg)
- GEOMETRY
- A slacker front headtube angle for predictable handling at speed across buff and technical terrain. A longer front-to-center measurement shifts the weight of the rider further behind the front wheel for more control to maneuver at high speeds.
- SUSPENSION
- Designed for 120mm front and rear travel, can be adjusted down to 100mm for optimal terrain performance. Faux bar system (four bar flex stay) kinematic designed for pedaling efficiency.
- COMPATIBILITY
- Cable management at the headtube allows for easy compatibility across components, including dropper posts and remote lockouts.
- BOTTLE MOUNTS
- Capable of carrying 2, 1 on the downtube and 1 on the seat tube
- TIRE CLEARANCE
- 29x2.4
Build Kit
- BOTTOM BRACKET
- Shimano XTR SM-BB93 BSA
- BRAKES
- Shimano XTR BR-M9100 180 Front / 160 Rear
- CASSETTE
- Shimano XTR M9101 12spd 10-51
- CHAIN
- Shimano XTR CN-M9100 12spd
- CRANKSET
- Shimano XTR FC-M9120-1
- FRONT DERAILLEUR
- N/A
- HANDLEBAR
- FSA SL-K MTB Carbon
- HANDLEBAR TAPE
- ESI Chunky
- REAR DERAILLEUR
- Shimano XTR RD-M9100 12spd SGS
- SADDLE
- Selle Italia Novus Boost
- SEATPOST
- Fox Transfer Factory 31.6
- SHIFT LEVERS
- Shimano XTR SL-M9100-1-R 12spd
- STEM
- Industry Nine A318
- TIRES
- MAXXIS Rekon 29x2.40 WT EXO/TR Tan Wall
- WHEELSET
- Industry Nine 1/1 Trail S Carbon Wheelset
Sizing Guide
SM | MD | LG | XL | |
Crankset | 170 | 170 | 175 | 175 |
Stem | 40 | 50 | 50 | 50 |
Frame Geometry
SM | MD | LG | XL | |
A. Stack | 598 | 609 | 622 | 633 |
B. Reach | 420 | 445 | 475 | 501 |
C. Front Center | 710 | 739 | 775 | 806 |
D. Seat Tube Angle | 76 | 76 | 76 | 76 |
E. Wheel Size | 29" | 29" | 29" | 29" |
F. Headtube Angle | 66.5 | 66.5 | 66.5 | 66.5 |
G. Fork Rake | 44 | 44 | 44 | 44 |
H. Head Tube Length | 95 | 105 | 120 | 135 |
I. Bottom Bracket Drop | 40 | 40 | 40 | 40 |
J. Wheelbase | 1145 | 1174 | 1210 | 1241 |
K. Chainstay Length | 435 | 435 | 435 | 435 |
L. Horizontal Top Tube | 569 | 596 | 630 | 659 |
M. Seat Tube Length | 395 | 420 | 450 | 500 |
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