The BBT-18 ifrom Park Tool s a heavy...
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The BBT-18 ifrom Park Tool s a heavy duty, investment cast tool for installing and removing all Shimano, ISIS Drive, and ISIS Overdrive eight-notch bottom bracket cups.
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Note: The BBT-18 is an updated version of the BBT-8 tool.
The outside diameter of the tool has been changed so it provides a universal fit on the following eight-notch cups:
The BBT-18 has 8 notches with an outside diameter of nominally 43.4mm. The inside-to-inside width is approximately 38mm. Each notch is approximately 3.9mm wide. The hole in the center of the casting is 22.5mm, and will not fit over the 30mm spindles.
Park Tool reference: BBT-18.