BC40 Frameset

Current lead time 8-10 weeks.

Regular price $4,350

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

1950 grams (Lrg)
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.
Designed for 120mm front and rear travel. Flex stay w/ kinematics designed for pedaling efficiency.
Cable management at the headtube allows for easy compatibility across components, including dropper posts and remote lockouts. Threaded BB.
Capable of carrying 2, 1 on the downtube and 1 on the seat tube

Frame Geometry

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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Lightweight Frame

When traversing countless steep pitches, weight matters. The target 1950g frame weight is achieved by careful placement of the most advanced composite materials available and countless hours iterating and testing to ensure ride performance, durability and strength are all in perfect balance.

Two Bottle Mounts

Hydration is critical on any long ride or race. The BC40 design allows for a full size bottle on the downtube and small bottle on the seat tube.

Aggressive Geometry

The needs and capabilities of a modern cross country bike have completely evolved. BC40 pushes the envelope of race worthy bikes with a 66.5 degree headtube angle and 76 degree seat tube angle to allow you to optimize your weight well behind the front wheel for descending and further forward when climbing in the saddle.

Made Here

Like all ALLIED bikes, the BC40 is carefully crafted one frame at a time in our headquarters in Bentonville, AR to ensure each bike is built to the highest standard of quality possible.

120mm Travel

BC40 bolsters a full 120mm of travel front and rear with kinematics carefully positioned for pedaling efficiency and easy tunability.

Customer Reviews

Based on 3 reviews
Brian Herlihy
BC 40 perfect geometry

I built up my frameset a month ago. I have ridden the BC40 for over 500 miles and absolutely love it. I am 6 feet and the large with a 40mm stem fits me perfectly. While the bike is more aggressive than my previous mtb (Scott Spark 900) it is still more comfortable (at least for me). What I am most impressed with is its balance. I feel perfectly centered and, as a result, find myself hitting corners and downhills faster than ever. All that and it climbs like a champ.

Nicky Charles
Rides like a dream

Only one ride in, but when ya know, ya know. The BC40 climbed great as expected, but it also surprised me by how well it descends. The Allied team was a pleasure to work with every step of the way and Allied Cycles is at the top of my list for my N+1.

magic carpet ride

This bike is the bomb truely an act of perfection. Climbs like a billy goat and decends like its glued to the rails. My new favorite bike by my new favorite bike company.