KCNC PF30 Adaptor for Rb/MtbUsed on PF30 (Dia. 46mm) BB shell bike frame, allows you to use 24 25(with shim) mm axle Shimano or KCNC compatible crankset. BB shell insertion diameter: 46mm(PF30 spec), Bearing inner diameter 24, 25mm(with shim). For Shimano 24mm axle crankset, For KCNC K type 25mm axle crankset. Can be used on both Road&MTB crankset
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