Shimano ULTEGRA FC-R8100 12-speed Crank HOLLOWTECH II crankset Optimum power transfer Best balance for lighter weight and efficiency New designed crank arm Maintains high rigidity and reduces weight 4-arm construction crankset Iconic design Product features Use: Road Group: Ultegra R8100 Model: FC-R8100 Q-factor: 146mm Threaded BB shell width: 68 / 70mm Construction: Hollowtech II.
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