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Corona Shimano Dura Ace 12s NK Size:50t Shimano 105 FC R7100 12 speed crankset Shimano 105 FC R7100 12 speed crankset with 50 34 chainrings and 172 Choose according to your shoe size Check that the size matches your crankset's current chainring to maintain the correct pairing It works with a HG 12 speed chain and has a pitch circle diameter of 110 mm
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