Constructed from precision-machined 4140 steel, the BBT-135-12 is a heavy duty tool for the removal and installation of select threaded bottom brackets with 12-notch tool fittings, including Praxis Works® M30. The BBT-135-12 is designed to be compatible with any bottom bracket with the corresponding tool fitting, with an extra-deep body to accommodate extra-wide spindles and low-profile walls at the point of engagement for recessed lockrings. The BBT-135-12 has three methods of tool engagement—a 3/8" drive fitting, a 1" hex fitting, and 36 mm wrench flats—allowing you to take on even the most seized bottom bracket cups. For added stability, the BBT-135-12 features integrated threads for use with the Park Tool BBT-RS Bottom Bracket Tool Retaining System or GPS-1 Guide Pins (each sold separately).

Fits 12-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 48–50 mm and a minor diameter (inside of notches) of 46.3 mm, including Praxis Works® M30.

Tool specifications:

• 3/8" drive fitting
  
• 1" and 36 mm wrench flats
  
• 57.5 mm (2.264") outer diameter at point of engagement
  
• Internal clearance: 42 mm (1.654") depth