Video
BBT-135-12 Steel Bottom Bracket Tool
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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"BBT-135-12 Steel Bottom Bracket Tool" is a cycling video from Park Tool published on April 15, 2026. Runtime 1 minute · 1,236 views. Topics: park tool and praxis works. Spot Sports collects Cycling highlight videos, podcast episodes, and live coverage from across the web so every conversation stays in one feed. Follow Cycling on Spot Sports to get the next highlight, scoring update, and podcast appearance pushed to your home feed. If you want to watch Cycling live, Spot Sports' watch-cost calculator maps your zip code to the cheapest legal way to stream every game without paying for tiers you don't need.
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