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