Shimano GRX FC-RX610 12 Speed Single Chainset - 40T - 172.5mm

Array of options delivers optimal gravel gearing for variety of needs

The SHIMANO FC-RX610-1 crank balances weight savings, optimized efficiency and an array of gearing options that cater to the segmented demands of mixed-terrain riding. By pairing a 10-45T or 10-51T cassette with 38T or 40T chainring, riders can choose closer gear steps or ultimate range depending on personal need. The FC-RX610-1 comes in 165, 170, 172.5, and 175 mm crank arm lengths, providing an additional level of customization.

Features:
- Optimal gearing for mixed-terrain riding. 10-45T and 10-51T cassette options serve array of riding styles
- 2-piece design bottom bracket bearings to be spaced wider apart, enabling the use of larger bearings and an increased axle diameter
- Compatible chain: HG 12-speed
- Chain line (mm): 49.7
- P.C.D. (mm): 110
- Spider/gear arms: 4
- Chainring combination: 38T or 40T
- Q-factor (mm): 151
- Recommended bottom bracket / Threaded: BB-RS501
- Recommended bottom bracket / Press-Fit: BB-RS500-PB
- Average weight: 812g