Purpose-built for cyclocross racing, the Shimano FC-CX50 delivers confident, reliable shifting and robust construction to handle the mud, sand, and repeated remounts that define the discipline. Paired with a 46-36T chainring combination and Shimano's Hollowtech II bottom bracket interface, it offers the gearing range and stiffness cyclocross racers need — lap after lap, in any conditions.

Highlights

• Cyclocross-specific gearing: 46-36T double chainring setup gives a wide range suited to the varied climbs, flats, and technical sections of a CX course.
• Hollowtech II 2-piece design: Integrated crank arm and spindle construction improves stiffness, reduces weight, and simplifies installation with a standard 24mm axle.
• Hyperdrive SG-X chainrings: Engineered tooth profile improves chain pickup and shifting precision with 10-speed HG chains — critical when mud and grit are present.
• Durable aluminium construction: 5-arm alloy crank arms and chainrings built to withstand the demands of race-day abuse and regular training rides.
• 110mm BCD: Standard 5-arm 110mm bolt circle allows chainring replacement with a wide range of aftermarket options.

Design

The FC-CX50 uses Shimano's Hollowtech II 2-piece design, where the right crank arm integrates with the bottom bracket spindle. This approach maximises stiffness-to-weight ratio while keeping the system accessible for home mechanics. The 150mm Q-factor is optimised for cyclocross positioning, and the 43.5mm chainline aligns correctly with 10-speed cassettes designed for road and cyclocross use.

Compatibility & Fit

Designed for 2x10-speed drivetrains using Shimano HG 10-speed chains. Requires a Hollowtech II-compatible bottom bracket (such as BB-RS501 or SM-BB71-41B Press Fit) — bottom bracket not included. Fits a 68mm BSA (threaded) or 41mm press-fit shell. BCD is 110mm 5-arm. Crank arm length: 170mm. Chainline: 43.5mm. Axle diameter: 24mm. Pedal thread: 9/16" x 20 TPI.