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The KCNC PF30 adapter is a true all-rounder among the bottom brackets. It allows it on road bikes or MTBs with PF30 frame (46mm inner diameter) both KCNC (25mm shaft diameter) and Shimano HT II (24mm shaft diameter) cranks to install. This is achieved by the included spacers. The high-quality processed and stable bottom bracket is composed of centrally bolted, CNC machined bearing shells in which sealed stainless steel bearings are installed for best durability.