Bottom brackets are among the components with the highest torque specifications on a bicycle. However, some bottom bracket shells have tool fittings that allow only a few millimeters of engagement, which can be problematic during disassembly or assembly. The solution is the Park Tool Bottom Bracket Tool Retaining System. The BBT-RS is used in conjunction with almost all Park Tool bottom bracket tools and employs a spring-based clamping system to exert a consistent, adjustable pressure on the tool. This ensures a complete engagement with the tool connection and prevents slipping. The BBT-RS can be configured for use with most bottom bracket standards, both threaded and non-threaded. It features an M8 threaded rod and a double-sided adapter nut with M12 and M15 threads, allowing it to be directly screwed into any compatible cartridge bottom bracket. The M15 adapter can also be used to mount any of Park Tool's nine aluminum bottom bracket tools, all of which have an integrated thread for use with the BBT-RS.

Features:

• Compatible with the following bottom bracket types: threaded shell, screwed together, cartridge, shell-and-cone
• Compatible with the following bottom bracket tools: 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-79.3, bottom bracket tools with wrench and handle, bottom bracket tools with external wrench flats
• Washer diameter: 57 mm (2.25")
• Rod length: 175 mm (6.9")
• Rod thread: M8 x 1.0
• Adapter nut threads: M12 x 1.0 and M15 x 1.0.