Shimano GRX FC-RX810 Hollowtech-II 175mm 2-Speed 31-48T CranksetSHIMANO GRXGravel Crankset2x11 speed SHIMANO's new FC RX810 2 crank balances weight and efficiency for mixed terrain riding. Gearing options cater for the specific demands of gravel riding and to maintain tighter gear steps for maintaining pedaling rhythm. The 2x11 speed crank is available in a 48 31T chainring combination and 170, 172. 5, and 175mm crank arm lengths. Optimum gearing for mixed terrains and riding styles Gravel gear ratios preserve