Wolf Tooth T47 External Bottom Brackets are engineered to be smooth, durable, lightweight, and user-serviceable. Their ground-up design features custom bearings, seals, bushings, and cups which eliminate creaking and balance best-in-class weather sealing with optimized bearing radial compression, alignment, and preload for low drag. The Wolf Tooth Bottom Bracket bearings feature custom designed balls and races made from hardened chrome bearing steel, which has a higher surface hardness than stainless to improve durability, reduce spinning resistance, and minimize noise. An ACOSUR ZNA coating has been applied to the race to provide corrosion resistance equal to or better than stainless steel after a 500-hour saltwater test. Best-in-class sealing is achieved by grouping a spindle o-ring, seals on the bearing/bushing gutter inner and outer, low contact bearing seals, shell o-rings, and a labyrinth-style end cap to ensure smooth operation in all conditions. Custom bushings separate the bearing inner race and crank spindle to eliminate metal-on-metal contact, the leading cause of bottom bracket creaks, while also aiding in bearing longevity with an interface to the bearing gutter seal for maximum weatherproofing. Wolf Tooth bottom brackets are designed, engineered, machined, and assembled in-house at Wolf Tooth HQ in Minnesota, USA. The adjustable-width internal sleeve fits 68mm to 73mm T47 bottom bracket shells.

Bottom Bracket Shell I.D.	47
BB/Frame Interface	T47
BB Shell Width (mm)	73
Weight	97
Spindle Interface Type	SRAM DUB
Defined Color	Black, Orange, Purple, Silver