Wolf Tooth BSA Bottom Brackets are engineered to be smooth, durable, lightweight, fast, and serviceable at home. Our 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. Wolf Tooth bottom brackets are machined at Wolf Tooth HQ in Minnesota, USA. Best-In-Class Sealing, No Sacrifice In Speed Thoughtfully engineered sealing is designed to balance low drag with superior performance in all conditions. The grouping of a spindle o-ring, seals on the bearing/bushing gutter, light inner and outer bearing race seals, shell o-rings, and a labyrinth-style end cap ensure your bottom bracket will spin smoothly no matter what conditions you ride in. No Creaks Custom bushings separate the bearing inner race and crank spindle to eliminate metal-on-metal contact, the leading cause of bottom bracket creaks. This bushing also helps enhance bearing longevity with an interface to the bearing gutter seal for maximum weatherproofing. No metal-on-metal contact, no creaks. It's simple. Installs With Standard Tools No proprietary tools required. Wolf Tooth BSA Bottom Brackets use standard spline tools. Use our precision Bottom Bracket Tools, or your existing 44-16 (24mm) or 46-12 (29mm DUB, 30mm) tools. Adjustable-Width Shell Our adjustable-width design allows the same BB shell to be used for 68mm - 73mm width BSA Bottom Brackets. 83mm DH shells and 100mm Fat Bike shells are available as add-ons for our BSA Bottom Brackets. Designed and Machined In-House Wolf Tooth Bottom Brackets are designed and engineered in-house from the ground up to be the best available option for any style of riding and every adventure. Technical Specifications Wolf Tooth BSA Bottom Brackets are engineered to be smooth, durable, lightweight, fast, and user-serviceable. Our 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. They're available for 24mm Shimano, 29mm DUB, and 30mm spindle diameters for maximum compatibility, and four colors to match your other Wolf Tooth Color Shop components. The bearings in Wolf Tooth Bottom Brackets feature a custom design. The balls and race are made from a hardened chrome bearing steel. This has a higher surface hardness than stainless, which improves the durability of bearing races and reduces 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 have superior performance in all conditions. Compatible with 24, 29 DUB, and 30mm spindle cranksets Adjustable-width sleeve fits 68mm - 73mm BSA bottom bracket shells Best-in-class weather sealing protects bearings from water, mud, and debris Custom polymer spindle bushings eliminate creaking Installation and removal with standard 44-16 (24mm) and 46-12 (29mm DUB, 30mm) spline tools Engineered, machined, and assembled at Wolf Tooth HQ in Minnesota, USA Replacement parts and service guides available via Wolf Tooth Right to Repair Lifetime warranty on bearings Bottom brackets ship with the following shell and spindle spacers: 2x 2.5mm shell spacers 24mm spindle - 2x 0.5mm, 2x 1mm, 2mm, 3mm, 5mm spindle spacers 29mm spindle - 2x 0.5mm, 2x 1mm, 3mm, 5mm, 7.5mm spindle spacers 30mm spindle - 2x 0.5mm, 2x 1mm, 2mm, 3mm, 5mm spindle spacers Compatibility 68, 73, 83, and 100mm width BSA bottom bracket shells Included adjustable-width internal sleeve fits 68-73mm width BSA bottom bracket shells 83 and 100mm width internal sleeves are available for purchase as add-ons