Wheels Manufacturing T47 Inboard Bottom Bracket for 24mm Spindles with ABEC-3 BearingsT47 Inboard threaded bottom brackets are made from machined aluminum, and thread together directly into T47 frames. Cups have internal bearings for use in BB shell widths from 68mm to 132mm. Compatible with 24. 00mm spindle diameter cranksets, like Shimano HollowTech II Fits 68mm 132mm shell widths High quality Enduro bearings can be easily serviced or replaced Similar to standard BSA threaded cups; the drive side cup is left hand thread and the non