The Shimano GRX FC-RX610-2 is a purpose-built gravel crankset that delivers reliable 2x12-speed performance across mixed terrain. With a 46/30T chainring combination, Hollowtech II construction, and a 47mm chainline optimised for road disc geometry, it's the go-to double crank for gravel racers and long-distance riders who want genuine gearing versatility without weight penalty.

Highlights

• Hollowtech II two-piece design: Integrated axle and hollow-forged aluminium crank arms deliver a stiff, lightweight power transfer platform.
• 46/30T gravel gearing: Wide range double chainring setup gives tight gear steps for riding in a bunch alongside the low range needed for loaded climbs.
• Asymmetric 110/80 BCD: GRX-specific bolt circle design accommodates the large 30T inner ring while maintaining structural rigidity.
• 47mm chainline: Matched to 135/142mm road disc rear axle standards for smooth, efficient chain angles across all 12 gears.
• 12-speed chain compatibility: Works with the full Shimano GRX 12-speed drivetrain ecosystem.
• Broad crank arm length range: Available in 165, 170, 172.5, and 175mm to suit a wide range of rider fits.

Built for Gravel

The GRX groupset was engineered specifically for gravel and mixed-terrain cycling, and the FC-RX610-2 crankset reflects that focus. The 46/30T ring combination covers everything from fast gravel racing to technical climbs, closing the gap to single-ring setups in the situations where front shifting matters. Hollow-forged aluminium arms keep the crank light without sacrificing the stiffness required for out-of-the-saddle efforts on rough roads.

Compatibility & Fit

This crankset is 2x12-speed and is designed for use with Shimano GRX 12-speed front derailleurs. The 47mm chainline is optimised for 135/142mm rear axle road disc hub spacing with a minimum 415mm chainstay. Bottom bracket not included — compatible with standard BSA threaded shells (68/70mm width) using brackets such as SM-BBR60 or BB-RS501, and Press Fit options including BB-RS500-PB. Pedal threading is 9/16". Spindle interface: Shimano Hollowtech II.