Shimano GRX FC-RX820 12-Speed Single Chainset

Shimano GRX FC-RX820 12-Speed Single Chainset The GRX FC-RX820 12-Speed Single Chainset 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 40T and 42T chainring; riders can choose closer gear steps or ultimate range. The FC-RX820-1 comes in 170; 172.5; and 175mm crank arm lengths; adding an additional level of customization.