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The Park Tool BBT-135-12 Steel Bottom Bracket Tool is a heavy-duty workshop tool machined from precision 4140 steel for removal and installation of threaded bottom brackets with 12-notch tool fittings. The BBT-135-12 fits 12-notch fittings with a major diameter of 48–50mm and a minor diameter of 46.3mm including Praxis Works M30 bottom brackets — a standard found across a wide range of contemporary road and gravel drivetrains. The extra-deep body handles extra-wide spindles and low-profile walls at the engagement point seat into recessed lockrings that standard-depth tools miss. Three drive options — 3/8" drive 1" hex and 36mm wrench flats — handle even heavily seized cups and integrated threads in the tool body accept the Park Tool BBT-RS Bottom Bracket Tool Retaining System or GPS-1 Guide Pins (each sold separately) for improved stability during service.Machined from 4140 steel for heavy-duty workshop use Fits 12-notch threaded bottom bracket tool fittings with a major diameter of 48–50mm and a minor diameter of 46.3mm Compatible with Praxis Works M30 bottom brackets Extra-deep body accommodates extra-wide spindles Low-profile walls at the point of engagement reach recessed lockrings Three drive options: 3/8" drive fitting 1" hex fitting and 36mm wrench flats Outer diameter at point of engagement: 57.5mm (2.264") Internal clearance: 42mm (1.654") depth x 30.44mm (1.198") diameter Integrated threads accept Park Tool BBT-RS or GPS-1 Guide Pins for added stability (each sold separately) Not rated for use with impact drivers
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