Park Tool BBT-59.3 — 16-Notch Bottom Bracket Tool

The BBT-59.3 is a precision CNC-machined aluminum tool designed for installing and removing select 16-notch threaded bottom brackets, including Shimano® Ultegra® BBR60 and Deore XT® MT-800. Manufactured in-house by Park Tool and anodized for easy identification, it features a 3/8" drive compatible with ratchets or torque wrenches for controlled, precise operation.

This tool is engineered for use with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately), which applies consistent, adjustable spring pressure to prevent slippage and ensure full engagement with the tool fitting.

Features

• Compatibility:

  • Fits 16-notch threaded bottom bracket tool fittings with:

    • Major diameter (outside of notches): 41–42 mm

    • Minor diameter (inside of notches): 39 mm

  • Shimano® Ultegra® BBR60

  • Shimano® Deore XT® MT-800

• Construction: CNC-machined aluminum with anodized finish

• Drive: 3/8" ratchet or torque wrench compatible

• BBT-RS Compatible: Integrated threads for Park Tool BBT-RS Bottom Bracket Tool Retaining System

• Note: Not designed for use with impact drivers or other power tools