Park Tool BBT-59.3 Bottom Bracket Tool 16-Notch Shimano Ultegra XT

Park Tool BBT-59.3 Bottom Bracket Tool 16-Notch Tool for Shimano Ultegra & Deore XT Bottom Brackets The Park Tool BBT-59.3 is a professional-grade bottom bracket tool designed for the installation and removal of 16-notch threaded bottom brackets with larger outer diameters. Precision-machined for exact fitment, it ensures secure engagement with bottom bracket cups—reducing slippage, rounding, and damage during service. Built to Park Tool’s exacting standards, the BBT-59.3 is ideal for both professional workshops and home mechanicsworking on modern Shimano road and mountain drivetrains. Key Features & Benefits Genuine Park Tool professional workshop tool Designed for 16-notch threaded bottom bracket cups Precision-machined for secure, slip-free engagement Prevents damage to aluminum and composite BB cups Durable construction for repeated shop use Compatibility Fits 16-notch bottom bracket cups with: Major diameter (outside of notches): 41–42 mm Minor diameter (inside of notches): 39 mm Compatible Bottom Brackets Include: Shimano Ultegra BBR60 Shimano Deore XT MT-800 Other Shimano 16-notch threaded bottom brackets with matching dimensions Tool Interface Compatible with 3/8" drive ratchets and torque wrenches Can also be used with a large adjustable wrench Ideal for accurate torque application per manufacturer specifications Recommended Use Bottom bracket installation and removal Road, gravel, and MTB drivetrain service Shimano Hollowtech II style threaded BB systems Professional bike shop and advanced home mechanic use Why Choose Park Tool? Park Tool tools are shop-proven, mechanic-approved, and built to last. The BBT-59.3 delivers precise fit, durability, and confidence when servicing modern Shimano bottom brackets—helping ensure smooth crank rotation and long-term reliability. An essential tool for clean, damage-free installation and removal of Shimano Ultegra and Deore XT bottom brackets.