The Shimano GRX FC-RX610-2 is a purpose-built 2x12-speed gravel crankset offering a wide-range 46/30T gear combination that keeps you turning the pedals efficiently on long climbs and fast gravel straights alike. Designed as part of the GRX 12-speed mechanical groupset, it suits gravel racers and adventure cyclists who want reliable, precise front shifting without compromise.

Highlights

  • Wide-range 46/30T gearing: Tight gear steps for bunch pace on the flat, genuine bailout gearing for loaded descents or technical climbs.
  • Hollowtech II construction: Two-piece hollow aluminium crank arms deliver excellent stiffness-to-weight, channelling power efficiently with every pedal stroke.
  • Asymmetric 110/80 BCD: Allows the compact 30T inner ring to sit close to the centre line, improving chainline and shifting performance across 12-speed cassettes.
  • Broad bottom bracket compatibility: Works with threaded (SM-BBR60, BB-RS501, BB-RS500) and press-fit (SM-BB92-41B, BB-RS500-PB) shells — fits virtually any modern gravel frame.
  • 12-speed optimised chainrings: Aluminium rings profiled for smooth, reliable shifting with Shimano 12-speed HG chains and GRX 12-speed derailleurs.
  • Q-Factor 151mm / Chainline 47mm: Gravel-specific geometry positions your feet for stability and power on mixed terrain.

GRX 12-Speed Gravel Platform

The FC-RX610-2 sits in Shimano's GRX 12-speed mechanical tier, balancing performance and value for riders who demand capable front shifting over long days in the dirt. The 24mm steel spindle interfaces with the full Shimano Hollowtech II bottom bracket range, so installation is straightforward regardless of your frame's shell standard.

Compatibility & Fit

Designed for 2x12-speed GRX drivetrains. Chainring BCD: 110mm outer / 80mm inner (asymmetric). Spindle interface: Shimano Hollowtech II (24mm). Chainline: 47mm. Q-Factor: 151mm. Hub spacing: 135/142mm Road Disc (chainstay ≥ 415mm). Pedal thread: 9/16". Compatible with Shimano 12-speed HG chains. Bottom bracket sold separately. This listing is for the 175mm crank arm length with 46/30T chainrings.

Shimano offers a limited warranty covering defects in materials and workmanship. For warranty support, return the item to Tune Cycles.
  • 2x12-speed GRX gravel crankset with 46/30T wide-range chainring combination
  • Hollowtech II two-piece hollow aluminium construction for stiffness and low weight
  • Asymmetric 110/80 BCD enables a compact 30T inner ring with optimised chainline
  • 24mm steel spindle compatible with full Shimano Hollowtech II bottom bracket range
  • Works with both threaded and press-fit bottom bracket shells
  • Aluminium chainrings optimised for 12-speed HG chain shifting performance
  • Chainline 47mm and Q-Factor 151mm suit gravel-specific frame geometry
  • Pairs with GRX 12-speed front and rear derailleurs for complete system performance
SeriesShimano GRX 12-speed
Part NumberFC-RX610-2
Speeds12-speed
Chainring Configuration2x (double)
Chainring Sizes46/30T
Crank Arm Length175mm
BCD110mm outer / 80mm inner (asymmetric)
Spindle InterfaceShimano Hollowtech II (24mm)
Chainline47mm
Q-Factor151mm
Hub Compatibility135/142mm Road Disc (chainstay ≥ 415mm)
Pedal Thread9/16"
Chain CompatibilityShimano 12-speed HG
Bottom BracketSold separately (Hollowtech II compatible)
ColourBlack
SKU SHM-EFCRX6102EX60
Barcode # 4550170639631
Brand Shimano

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