BOTTOM BRACKET TOOL 16 NOTCH 39MM SHIMANO DURA-ACE XTR PARK TOOL BBT-49.3

The Park Tool BBT-49.3 is the 16-notch 39 mm bottom bracket tool dedicated to Shimano Dura-Ace and XTR threaded bottom brackets with compact cups. It is the tool to use when the classic Hollowtech II tool does not fit: on Dura-Ace BB9000 and BB-R9100 and on XTR BB93, the cups have a smaller diameter and need a dedicated profile. It replaces the Shimano TL-FC38 tool.

It is CNC-machined from solid aluminium in-house by Park Tool and anodized for instant identification. The 16 notches have a major diameter of 39-40 mm and a minor diameter of 37.6 mm. The 3/8" square drive works with ratchets and torque wrenches, while the integrated threads accept the BBT-RS retaining system, sold separately, which uses an adjustable spring to keep the tool fully engaged and prevent it from slipping off the notches during removal.

Where to use the 39 mm Shimano bottom bracket tool

• Shimano Dura-Ace BB9000 and BB-R9100 bottom brackets
• Shimano XTR BB93 bottom brackets
• Token bottom brackets with compatible 16-notch cups
• Shimano STEPS E6000, E6002 and E6050 chainring lockrings on square-spindle e-bikes

Why choose Park Tool BBT-49.3

• 16-notch 39 mm profile specific to compact Dura-Ace and XTR cups
• CNC-machined aluminium, light and precise
• 3/8" drive to tighten with a torque wrench to Shimano's specified torque
• Integrated threads for the BBT-RS retaining system
• Also useful in the e-bike workshop for Shimano STEPS chainring lockrings

The tool is not designed for impact drivers or other power tools. For anyone working on high-end Shimano road and mountain bikes, the Park Tool BBT-49.3 16-notch 39 mm bottom bracket tool is the specific tool that belongs next to the traditional Hollowtech II tool.