Wolf Tooth

T47 External Bottom Bracket - For 30mm Spindle

Wolf Tooth T47 External Bottom Bracket - For 30mm Spindle delivers a precision-engineered solution for riders who demand smooth operation, long-term durability, and quiet performance. Designed and machined in Minnesota, this bottom bracket combines tight tolerances with premium materials to create a component that performs flawlessly in all conditions.

Built around custom AlSI 52100 chrome steel bearings with a hardened surface finish, it reduces friction and noise while increasing service life. A ZNA corrosion-resistant coating provides protection that rivals or exceeds stainless steel, even after extended exposure to moisture and grit. Wolf Tooth’s advanced sealing system uses multiple layers of defense to keep contaminants out, ensuring reliable performance through mud, rain, or dust.

The T47 External Bottom Bracket also features custom bushings that isolate the crank spindle from the bearing inner race. This eliminates metal-on-metal contact—the most common cause of creaks—and contributes to a quiet, efficient ride. An adjustable-width internal sleeve allows compatibility with 68mm to 73mm T47 shells, offering an easy fit for a wide range of frames.

• Precision-machined and assembled in the USA for exact fit and lasting performance
• Custom hardened chrome steel bearings with ZNA coating for low friction and corrosion resistance
• Comprehensive multi-seal system keeps out water and debris for smooth rotation in all weather
• Custom bushings eliminate metal-on-metal contact to prevent creaking and extend bearing life
• Adjustable-width internal sleeve fits 68mm–73mm T47 bottom bracket shells

For riders who value smooth pedaling efficiency, quiet operation, and long-term reliability, the Wolf Tooth T47 External Bottom Bracket is a top-tier upgrade built to perform mile after mile.