BBT-135-12 Steel Bottom Bracket Tool

Name: BBT-135-12 Steel Bottom Bracket Tool
Uploaded: 2026-04-15T15:21:45.000Z
Duration: 1 min

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Apr 15, 20261:001.2K views

Park Tool Praxis Works

More info: parktool.com/BBT-135-12

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 (from tool face) x 30.44 mm (1.198") diameter
• Not rated for use with impact drivers

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