Park Tool BBT-59.3 Bottom Bracket Tool - 16 Notch - 39-42mm

A precision CNC-machined aluminium tool for the installation and removal of select threaded bottom brackets with 16-notch tool fittings, including Shimano Ultegra BBR60 and Deore XT MT-800 bottom brackets. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8 inch drive.

The BBT-59.3 features integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold seperately). The BBT-RS uses an adjustable spring-based tension system to apply consistent, adjustable pressure to the tool, ensuring full engagement with the tool fitting and prevent slippage.

Features:
- Fits 16-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 41-42mm and a minor diameter (inside of notches) of 39mm, including:
- Shimano Ultegra BBR60
- Shimano Deore XT MT-800
- 3/8 inch drive fitting

NOTE: Do not use Park Tool aluminium bottom bracket tools with impact drivers.