The Wolf Tooth T47 Internal Bottom Bracket is built around a bearing system that earns its keep in the real world — custom-designed balls and races machined from hardened chrome bearing steel, then treated with an ACOSUR ZNA coating that delivers corrosion resistance comparable to stainless after a 500-hour saltwater test. The result is a bottom bracket that stays quiet, spins freely, and holds up across seasons. Creaking is eliminated through custom polymer spindle bushings that remove metal-on-metal contact entirely. The adjustable-width sleeve fits T47 internal shells from 85.5mm to 92mm, and the whole unit installs and removes with a standard 52-16 spline tool — no specialist kit required. Wolf Tooth also backs every bottom bracket with a lifetime warranty on the bearings and a Right to Repair program, so replacement parts and service guides are available when you need them. Wolf Tooth T47 Internal Bottom Bracket Specs at a Glance Spindle compatibility: 29mm DUB (also available in 24mm and 30mm variants) Shell compatibility: T47 Internal, adjustable 85.5mm – 92mm width Bearing material: Hardened chrome steel with ACOSUR ZNA corrosion-resistant coating Tool interface: Standard 52-16 spline Origin: Engineered, machined, and assembled in Minnesota, USA
