The Shimano GRX FC-RX610-1 is a purpose-built 1x12-speed crankset designed for gravel and mixed-terrain riding. Combining the efficiency and refinement of Shimano's GRX drivetrain with a clean single-chainring setup, it delivers confident, clutter-free performance on everything from sealed roads to rough gravel tracks. The 40T chainring paired with a 172.5mm crank arm length suits a wide range of riders and terrain, whether you're chasing gravel events or exploring remote tracks.

Highlights

• GRX 12-Speed Platform: Engineered specifically for gravel riding, with wider gear range compatibility and optimised shifting performance across mixed terrain.
• Hollowtech II Spindle Interface: Shimano's proven hollow-forged crank arm technology delivers exceptional stiffness and power transfer with minimal weight.
• 110 BCD Asymmetric Spider: The 4-bolt 110mm BCD spider accepts GRX-compatible chainrings, giving you flexibility to swap ring sizes down the track.
• 40T Single Chainring: A versatile ring size that pairs efficiently with a 10-45T or 10-51T cassette for broad gearing range across varied gradients.
• 172.5mm Crank Length: A mid-length arm that suits a wide range of rider heights and riding positions.
• Clean 1x Setup: Single-chainring design eliminates the front derailleur for a simpler, lower-maintenance drivetrain.

Gravel-Specific Engineering

The FC-RX610 is part of Shimano's GRX 12-speed mechanical groupset — the first mechanical GRX platform to offer 12-speed performance. The crankset is designed with a 49.7mm chainline and 151mm Q-factor optimised for gravel geometry, providing improved mud clearance and pedalling efficiency compared to road-specific cranks.

Compatibility & Fit

Compatible with Shimano GRX 12-speed drivetrains. Requires a Shimano-compatible Hollowtech II bottom bracket (sold separately). Chainring BCD: 110mm asymmetric (4-bolt). Recommended cassette range: 10-45T or 10-51T. Suitable for frames with 135mm or 142mm road disc spacing and chainstays longer than 415mm. Pedal thread: 9/16".