BOTTOM BRACKET TOOL RETAINING SYSTEM PARK TOOL BBT-RS

The Park Tool BBT-RS is the bottom bracket tool retaining system that keeps the tool fully engaged in the shallow fittings of the cups, preventing it from slipping during removal or installation. It is the answer to the classic damaged fittings that appear when a tool jumps out under load.

The principle is simple: an M8 x 1.0 threaded rod, 175 mm long, passes through the bottom bracket and connects to the tool via a double-sided adapter nut with M12 x 1.0 and M15 x 1.0 threads. A spring with adjustable tension, a 38 mm speed nut and a 57 mm washer press the tool against the cup for the whole job, leaving your hands free to concentrate on the torque being applied. Without having to push the tool against the cup with your other hand, you can work cleanly with a ratchet or torque wrench, even when the notches are shallow or already marked by previous jobs.

Which bottom brackets and tools work with the Park Tool BBT-RS

• Threaded cup, thread-together, cartridge and cup-and-cone bottom brackets
• Park Tool BBT-27.3, BBT-35-12, BBT-35-36, BBT-47-12, BBT-47-16, BBT-49.3, BBT-59.3, BBT-69.3, BBT-69.4 and BBT-79.3
• Wrench-style tools with a handle such as BBT-9, BBT-29 and HCW-4
• Tools with external wrench flats such as BBT-19.2 and BBT-22
• With the BBT-69.4, removing disc brake rotor lockrings on thru-axle hubs up to 148 mm wide

Why choose the Park Tool BBT-RS

• Adjustable spring tension that keeps the tool fully seated in the notches
• Reduces the risk of damaging cup notches when the tool slips
• Double-sided adapter nut for use with a wide range of Park Tool tools
• Also useful on rotor lockrings of thru-axle hubs, together with the BBT-69.4
• Instructions and parts list available as a PDF on the Park Tool website

Shallow notches are exactly where an unrestrained tool tends to slip. The Park Tool BBT-RS bottom bracket tool retaining system turns every job into a safe and controlled operation, from the pro workshop bench to the home garage.