Wolf Tooth T47 External Bottom Bracket - T47 External, 68/73mm, For 30mm Spindle, Ultraviolet Purple

Wolf Tooth T47 External Bottom Brackets are engineered for smooth, durable performance with custom bearings, seals, and bushings that eliminate creaking. Ground-up design features hardened chrome bearing steel with ZNA corrosion-resistant coating—proven equal to stainless steel in 500-hour saltwater testing. Best-in-class sealing combines spindle o-rings, bearing/bushing gutter seals, low-contact bearing seals, shell o-rings, and labyrinth-style end caps for all-condition reliability. Custom bushings eliminate metal-on-metal contact, the leading cause of creaks, while optimizing bearing longevity and weatherproofing. Fits 68mm–73mm T47 shells with adjustable-width internal sleeve. Includes spacer kit: (2) 2.5mm shell spacers, (2) 0.5mm spindle spacers, (2) 1mm spindle spacers, and individual 2mm, 3mm, and 5mm spindle spacers for precise fit. Designed, engineered, machined, and assembled in-house at Wolf Tooth HQ in Minnesota, USA. Installation requires a standard spline 46-12 bottom bracket tool (sold separately).