Park Tool BBT-49.3 16-Notch Bottom Bracket Tool Shimano XTR Dura-Ace

Park Tool BBT-49.3 Bottom Bracket Tool – 16 Notch

The Park Tool BBT-49.3 is a professional-grade bottom bracket tool designed for the installation and removal of 16-notch threaded bottom brackets. Precision-machined and shop-proven, it provides a secure, slip-free interface for modern Shimano road, MTB, and STEPS e-bike bottom brackets.

Manufactured in-house by Park Tool, the BBT-49.3 features durable anodized aluminum construction and a 3/8" drive interface, making it compatible with ratchets and torque wrenches for accurate installation.

Key Features & Benefits

• 16-notch bottom bracket compatibility
  Designed for BB cups with:

  • Major diameter: 39–40 mm

  • Minor diameter: 37.6 mm

• OEM-level fit and engagement
  Ensures secure, damage-free installation and removal

• Ratchet & torque wrench compatible
  Standard 3/8" drive allows precise torque application

• Anodized aluminum construction
  Durable, corrosion-resistant, and easy to identify in the toolbox

• Shop-quality precision
  Manufactured in-house by Park Tool for consistent tolerances

Compatibility

✔ Bottom Brackets

• Shimano XTR BB93

• Shimano Dura-Ace BB9000

• Token 16-notch bottom brackets

✔ E-Bike Systems

• Shimano STEPS square spindle systems:

  • E6000

  • E6002

  • E6050

✔ Tool Replacement

• Direct replacement for Shimano TL-FC38

Recommended Uses

• Bottom bracket installation and removal

• Routine drivetrain service

• Road, MTB, gravel, and e-bike maintenance

• Professional shop and home workshop use

Why Choose Park Tool?

Park Tool sets the global standard for bicycle service tools. The BBT-49.3 delivers precise fitment, long-term durability, and torque-accurate installation—exactly what modern bottom brackets demand.

A must-have tool for mechanics servicing Shimano road, MTB, and STEPS e-bike bottom brackets.