The T47 Inboard threaded bottom brackets are made of machined aluminum, and are designed to fit directly into T47 frames. The cups have internal bearings for BB shell widths ranging from 68mm to 132mm. Enduro Angular Contact bearings are easily replaced or serviced. The drive side cup is left-hand thread and the non-drive side cup is right-hand thread, similar to standard BSA threaded cups. It is designed to fit 29mm spindles on SRAM DUB cranks, and an included sleeve provides added protection and prevents internal wires from rubbing on the crank spindle.