Wheels Manufacturing T47 Outboard Bottom Bracket - DUB Spindle, ABEC-3 Bearing, BlackT47 Outboard threaded bottom brackets are made from machined aluminum, and thread together directly into T47 frames. Cups have outboard bearings, and are typically used in BB shells with widths from 68mm to 100mm. Designed to fit 29mm spindles on SRAM DUB cranks Cups have outboard bearings, and can be used in BB shells with widths from 68mm to 100mm Included sleeve fits between cups for added protection, and keeps internal wires from rubbing the crank