Converts BB30 shells (42mm ID 68mm road/73mm mountain) to accept most 24mm or 24/22mm spindle cranks\n Offered in 24mm (Shimano, FSA, Race Face, etc) or GXP 24/22mm (SRAM/Truvativ) for installation into BB30 frames without the need for adapters\n Includes anodized aluminum cups with Enduro sealed bearings\n Angular contact: Enduro ABEC 5 angular contact bearings\n Base: Enduro ABEC 3 sealed bearings