Wolf Tooth T47 External Bottom Bracket - T47 External 68/73mm For SRAM DUB Spindle Ultraviolet Purple. Wolf Tooth T47 External bottom Brackets are engineered to be smooth durable lightweight fast 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 that are made from a hardened chrome bearing steel which has a higher surface hardness than stainless to improve the durability reduce spinning resistance and noise. An ACOSUR ZNA coating has also been applied to the race to provide corrosion resistance that is equal to or better than stainless steel after a 500-hour saltwater test. Bearing material paired with an extensive sealing system and the elimination of metal-on-metal contact means Wolf Tooth Bottom Brackets deliver superior performance in all conditions. Wolf Tooth bottom brackets are designed engineered machined and assembled in-house at Wolf Tooth HQ in Minnesota USA.

Best-in-class sealing 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 your bottom bracket will run smoothly no matter what conditions you ride in

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

Custom AlSl 52100 chrome bearing steel hardened to Rc 61-66 reduces friction for smooth pedaling with ZNA corrosion-resistant coating

Adjustable-width internal sleeve fits 68mm - 73mm T47 bottom bracket shells