Constructed from precision-machined 4140 steel, the BBT-147-12 is a heavy duty tool for the removal and installation of select threaded bottom brackets with 12-notch tool fittings, including Chris King® ThreadFit™ T47 and ThreadFit™ 30. The BBT-147-12 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-147-12 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-147-12 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 50–53 mm and a minor diameter (inside of notches) of 48.2 mm, including: BBInfinite® T47 Chris King® ThreadFit™ 30 Chris King® ThreadFit™ T47 Chris King® ThreadFit™ T47 24x Chris King® ThreadFit™ T47 30 Hambini T47 Rotor® T47 External 30 mm Rotor® BBright®, BB30, BB386EVO, and PF30 thread-together 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
