Wheels Manufacturing T47 Inboard Bottom Bracket - For 30mm Spindle ABEC-3 Bearings Fits Frames 68mm-132mm BB Shells BlueWheels Manufacturing T47 Inboard Bottom Bracket For 30mm Spindle ABEC 3 Bearings Fits Frames with 68mm 132mm BB Shells Blue. T47 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. High quality Enduro bearings can be easily serviced or replaced Similar to standard BSA threaded cups; the drive side cup is left hand