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Shimano FC-RX600 46 / 30T 170mm 10-speed crankset Optimal shifting for mixed terrain and riding styles Higher wide-range shifting for longer rides or unknown terrain Gear combination: 46-30T Shimano's new FC-RX600-10 crank arm balances weight and efficiency for running on mixed terrain. The range of gears meets the specific requirements of off-road racing while maintaining tighter gears for a steady pedaling pace. The 2x10-speed crank arm is available with 46-30T chainrings, in lengths of 170, 172.5 and 175mm.