Park Tool BBT-135-12 Bottom Bracket Tool

The BBT-135-12, precision-machined from 4140 steel, is a high-performance tool for removing and installing select threaded bottom brackets with a 12-notch tool holder, including the Praxis Works® M30. The BBT-135-12 is designed to be compatible with any bottom bracket featuring the corresponding tool shank. It features an extra-deep body for particularly wide axles and flat walls at the engagement point for recessed lockrings. The BBT-135-12 offers three tool attachment options—a 3/8” drive, a 1” hex, and 36-mm wrench flats—so you can loosen even the most stubborn bottom bracket shells. For added stability, the BBT-135-12 features integrated threads for use with the Park Tool BBT-RS Bottom Bracket Tool Retention System or the GPS-1 guide pins (each sold separately).

Features of the Park Tool BBT-135-12 Bottom Bracket Tool

• Fits 12-notch threaded connections on bottom brackets with a major diameter (outside the notches) of 48–50 mm and a minor diameter (inside the notches) of 46.3 mm, including Praxis Works® M30.

Tool Specifications:

• 3/8" drive
• 1" and 36 mm wrench flats
• 57.5 mm (2.264") outer diameter at the engagement point
• Internal clearance: 42 mm (1.654") depth (from front of tool) x 30.44 mm (1.198") diameter
• Not suitable for use with impact wrenches