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Have a mountain bike frame that needs a PF30 bottom bracket but you are using a Shimano crankset that has a 24mm crank spindle? NO PROBLEM! This bottom bracket will allow your PF30 bottom bracket to accept the 24mm crank instead of a 30mm crank which is typically used in a PF30 bottom bracket. Our World Champion Ceramic Nitride Pro Series bearings are incorporated in a precisely engineered shell with exacting tolerances.