Crank groupThe crankshaft has two important functions: to convert pedaling action into driving system power; Provide fast and accurate front shifting. The FC-R9200 features a lightweight HOLLOWTECH II (second-generation hollow technology) crank arm and Shimano high-end sprocket design, making it an ideal choice for drivers. The crank arm is shorter, making it suitable for all drivers.
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Bicycle bottom bracket
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Bicycle metal single¡