Inspired by the legendary Back 40 trail system right here in Bentonville, the BC40 is a modern racing machine that updates the XC playbook. It combines the sharpness of a race-day bike with the control and confidence of an all-day trail sled. The namesake trail demands a thoughtful bike like this due to its often unpredictably rocky surface, dynamic corners, and endless, punchy climbs. The 120mm suspension is just leggy enough to tame rocky ledges and intermittent flow features, yet it also provides a second-to-none pedaling platform that translates power and efficiency. The suspension performance is anchored by a progressive steering geometry that ensures precise handling and tracking with stability at speed.
Recent improvements include 100g weight savings, stiffer front triangle, stronger and more durable, co-molded bottom bracket insert, and a co-molded alloy insert for the main pivot bearing bores that improves bearing life and ease of maintenance
In-house development and testing that included building our own testing methodology and machines as well as testing our competitors' bikes to benchmark performance and tearing them apart to weigh each component item
Designed to stretch the capability of what a cross-country bike can do while making no compromises with weight and pedaling efficiency
Aluminum suspension linkage, left-side dropout interface/brake mount, and cable management inserts machined in house to ensure the highest precision for alignment and component fitment
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
Build Kits
SRAM XX SL Eagle Transmission: The SRAM XX SL Flight Attendant Bike is the ultimate hi-tech racer. It’s a rolling showcase for the XX SL Eagle Transmission and the new Flight Attendant suspension system. This build kit represents the pinnacle of SRAM’s racing technology. Flight Attendant actively learns how you ride and auto-adjusts your suspension on the fly. For every change in terrain, every change in gradient, and every change in the way that you pedal – you’ll hear your suspension adjust before you even realize there is a need. Flight Attendant maximizes your suspension’s capability to help you maximize your potential.
Shimano XTR M9200 Di2: A race-focused BC40 equipped with Shimano’s latest top-spec Di2 electronic drivetrain.
SRAM X0 Eagle Transmission: The SRAM X0 Eagle Transmission Bike is where hi-tech meets rugged dependability. The X0 group features an all-new alloy crankset - SRAM’s lightest ever. Like all Transmission groups, this crankset works in harmony with the flattop chain, wide-ratio 12-speed cassette, and rear derailleur to deliver crisp, quick shifts every time you tap the two button wireless remote shifter.
SRAM GX Eagle Transmission: The SRAM GX Eagle AXS Transmission Bike provides an awesome blend of performance and cost savings compared to our other SRAM BC40 offerings. SRAM likes to call GX their “People’s Champion.” It combines the same wireless AXS shifting technology as their more expensive groups with a ruggedness that makes it the most durable groupset in the SRAM MTB lineup. Like all Transmission groups, the GX parts work in perfect harmony to ensure precise shifts, even under heavy load.
Shimano XT M8200: BC40 in Shimano’s workhorse build kit with a massive appetite for fast XC rides.
Frameset: The BC40 Frameset is the perfect foundation for you to build your dream bike with all of the component options of your own choosing. Might we suggest starting with custom paint? It comes with a Wolf Tooth Performance IS 41/52 Headset and a RockShox SIDLuxe Ultimate 3P Rear Shock as standard equipment. There are upgrade options for both as well as options to add forks too.
