Built for fast, mixed-terrain gravel riding, the Shimano GRX FC-RX610-1 is a 1x12-speed crankset that strips away the front derailleur for simpler, quieter and more reliable shifting when the surface turns rough. A single 40T chainring keeps your chain secure over chatter and ruts while delivering an efficient, wide-range setup for everything from sealed road transfers to loose backroads.

Highlights

• Dedicated 1x12-speed gravel crankset with a 40T chainring
• 175 mm crank arm length, suited to taller riders and powerful pedalling
• Hollowtech II forged alloy arms for stiffness with low weight
• GRX-specific 49.7 mm chainline optimised for wide-range gravel cassettes
• 151 mm Q-factor for a natural, road-like stance

Simpler, more reliable 1x shifting

Going without a front mech means one less thing to think about and one less thing to go wrong. The dedicated single chainring is engineered to hold the chain securely through rough, vibrating terrain, so you can focus on the trail ahead rather than dropped chains.

Efficient power transfer

Hollowtech II construction pairs forged aluminium crank arms with a hollow steel axle for a stiff, efficient platform that puts your effort into forward motion. The 49.7 mm GRX chainline is tuned to work cleanly across wide-range 12-speed gravel cassettes for crisp shifting and good cornering clearance.

Compatibility & fit

This is a 1x12-speed crankset using the Hollowtech II spindle interface and a 110 mm, 4-arm bolt circle. It pairs with Shimano 12-speed gravel and mountain bike cassettes such as 10-45T and 10-51T, and with Hollowtech II road/gravel bottom brackets. Confirm your frame's bottom bracket standard and rear tyre/chainstay clearance before fitting.