Park Tool - BBT-18 BB/Chainring Lockring Tool S3-Brand-ONTRACK The tool is pulled through

The tool is pulled through the frame until the flared ends snap in behind the cup

The ergonomic design makes it precise and easy to use

Effective for a long time

9 cm diameter patch with an iron-on backing

Park Tool - BBT-18 BB/Chainring Lockring Tool S3-Brand-ONTRACK The tool is pulled throughPARK TOOL BBT 18 BB CHAINRING LOCKRING TOOL The BBT 18 is a heavy duty, investment cast tool for installing and removing all Shimano, ISIS Drive, and ISIS Overdrive eight notch bottom bracket cups. Note: The BBT 18 is an updated version of the current BBT 8. The outside diameter of the tool has been changed so it provides a universal fit on all Shimano and ISIS Drive eight notch cups.