Park tool BBT-49.3 16 Notch 39 mm bottom bracket tool

Pro-grade maintenance is at your fingertips with the PARK TOOL BBT-49.3. This precision 16-notch, 39mm bottom bracket tool ensures damage-free installation and removal of high-end Shimano® XTR®, Dura-Ace®, and Token® external bearing bottom brackets, plus select Shimano® STEPS e-bike motor lockrings. Its exact fit maximizes engagement, preventing slippage and component damage while allowing precise torque application with any 3/8 drive wrench. Essential for secure, creak-free builds and reliable drivetrain longevity