BOTTOM BRACKET TOOL 16 NOTCH 49MM PARK TOOL BBT-27.3

The Park Tool BBT-27.3 is a 16-notch bottom bracket tool of about 49 mm diameter, designed to install and remove threaded and thread-together bottom brackets such as FSA MegaEvo and Wheels Manufacturing T47 and PF30. It is the right tool for anyone working on modern frames who wants to tighten cups to the correct torque.

The body is CNC-machined from aluminium, made in-house by Park Tool and anodized so you can spot it at a glance on the tool board. The 3/8" drive accepts ratchets and torque wrenches, so every cup is tightened to the value specified by the manufacturer. The notches have a major diameter of 48-50 mm and a minor diameter of about 46.1 mm, for full, stable engagement.

Where to use the BBT-27.3 bottom bracket tool

• FSA MegaEvo bottom brackets
• Wheels Manufacturing T47
• Wheels Manufacturing PF30 thread-together
• Other 16-notch threaded and thread-together bottom brackets in the Park Tool fitment table
• Not compatible with Hope BSA30

Why choose Park Tool BBT-27.3

• CNC-machined aluminium: light and precise in its tolerances
• Coloured anodizing to identify the size instantly
• 3/8" drive for working with a torque wrench
• Compatible with the BBT-RS retaining system (sold separately) to keep the tool aligned

A practical tip: before tightening a new cup, clean and grease the shell threads, screw the cups in by hand until they seat and only then apply the final torque with the torque wrench. This avoids cross-threading and gives a quiet, smooth-running bottom bracket over time, even on more delicate frames.

The tool is not designed for impact drivers or other power tools. For the latest 16-notch bottom brackets, the Park Tool BBT-27.3 bottom bracket tool delivers clean, repeatable work.