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Shimano Crankset 11s FC-RX810-2 48 / 31T 172.5mm Optimal shifting for mixed terrain and riding styles Gravel gear ratios preserve pace on rough surfaces with wider tires Higher wide-range front system 17T front range Combination of ratios: 48-31T Shimano's new FC-RX810-2 crank arm balances weight and efficiency for mixed terrain riding. The range of gears meets the specific requirements of off-road racing while maintaining tighter gears for a steady pedaling pace. The 2x11-speed crank is available with 48-31T chainrings, in lengths of 170, 172.5 and 175mm.