Praxis Works

M30 Thru T47 Asymmetric Bottom Bracket - 76.75/81.25mm

The Praxis Works M30 Thru T47 Asymmetric Bottom Bracket is a purpose-built solution for bikes using a T47 threaded, asymmetric shell in 76.75mm or 81.25mm widths, delivering a secure, serviceable interface for modern 30mm-spindle cranksets. Its M30 layout uses a 30mm drive-side bearing paired with a 30mm non-drive bearing to properly support compatible cranks while maintaining durable sealing and smooth rotation for high-mileage use.

• T47 Asymmetric Fit (76.75/81.25mm) - Correct sizing for the specific wide/asymmetric T47 shells used on select gravel/MTB frames, helping ensure proper chainline and crank clearance
• M30 Bearing Arrangement - 30mm drive-side bearing plus 30mm non-drive bearing designed for the loads and packaging demands of Praxis M30-style systems
• Crank Compatibility - Built for Praxis Lyft and compatible with 30mm spindle cranks including SRAM, Race Face/Easton Cinch, Rotor REX/3D+ 30mm, 5Dev, and Cane Creek eeWings
• Enduro Bearings + High-Grade Grease - Proven bearing quality and lubrication aimed at consistent smoothness and longevity in wet, dusty, and high-torque conditions
• Tooling Note - Requires the Praxis M30 BB tool for installation; for versions with external cups use PX8980/8981