The Park Tool BBT-49.3 Bottom Bracket Tool, click to enlarge
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Item # BBT-49.3

/ Tools / Crank & Bottom Bracket / E-Bike

Bottom Bracket Tool — 16-Notch

A precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 16-notch tool fittings, including Shimano® XTR® BB93, Dura-Ace® BB9000, and Token® bottom brackets. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive.

The BBT-49.3 features integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately). 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 preventing slippage.

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BBT-49.3 Features

Fits 16-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 39-40 mm and a minor diameter (inside of notches) of 37.6 mm, including:

  • Shimano® XTR® BB93
  • Shimano® Dura-Ace® BB9000
  • Shimano® Dura-Ace® BB-R9100
  • Token®

Also fits chainring lockrings on Shimano® STEPS square spindle e-bike systems including:

  • E6000
  • E6002
  • E6050

Replacement for Shimano TL-FC38 tool.

Not designed for use with impact drivers or other power tools.

Product Fitment

Below is a filterable table of bottom bracket models the BBT-49.3 is compatible with. For a full list of tool compatibility, see our Bottom Bracket Tool Finder.

Shimano® Threaded Dura-Ace® and XTR® Outboard

Parts & Accessories


Bottom Bracket Tool Retaining System

BBT-49.3 Bottom Bracket Tool — 16-Notch 39 mm