The Shimano GRX FC-RX610-2 is a purpose-built 2x12-speed gravel crankset delivering the gearing versatility and mechanical reliability that mixed-terrain riders depend on. Paired with 46/30T chainrings and a 165mm crank arm length, it's ideal for shorter-statured riders and those seeking a quicker pedal stroke on varied gravel terrain.

Highlights

• Gravel-optimised gearing: The 46/30T chainring combination keeps gear steps tighter for better cadence control when transitioning between road sections and rough gravel.
• Hollowtech II interface: Shimano's proven two-piece crank design delivers a stiff, lightweight connection between crank arms and bottom bracket, minimising power loss on every pedal stroke.
• 110/80mm asymmetric BCD: Shimano's Asymmetric chainring bolt circle allows a compact 30T inner ring to sit closer to the frame, improving chainline on small chainrings without compromise.
• 12-speed compatibility: Tooth profiles on both rings are engineered for smooth, reliable front shifting with Shimano 12-speed GRX groupsets and narrow 12-speed chains.
• 47mm chainline: Optimised for GRX 12-speed rear derailleurs and cassettes, keeping the drivetrain aligned across the full gear range.
• Aluminium construction: Lightweight alloy crank arms balance weight savings with the stiffness needed for sustained climbing and loaded touring.

GRX 12-Speed Platform

The FC-RX610-2 sits within Shimano's GRX 12-speed mechanical groupset — designed from the ground up for gravel and adventure cycling. The wider gear range and improved front derailleur action of the 12-speed platform mean you spend less time wrestling with shifts and more time riding. At 815g (with chainrings, 170mm reference), the FC-RX610-2 delivers solid performance at a price point accessible to gravel riders building their first dedicated setup or upgrading from an older 10 or 11-speed system.

Compatibility & Fit

Designed for Shimano GRX 12-speed (2x) drivetrains. Requires a separate Shimano Hollowtech II-compatible bottom bracket (sold separately — threaded options include BB-RS501, BB-RS500; press-fit options include SM-BB92-41B). Chainring BCD: 110mm outer / 80mm inner (Shimano Asymmetric). Chainline: 47mm. Q-factor: 151mm. Crank arm length: 165mm. Compatible with Shimano 12-speed HG chains and GRX 12-speed front derailleurs.