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Old 02-16-19 | 05:49 PM
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Bottom Bracket Thread Direction


Does a bottom bracket have reverse threads? I don’t know much about it other than square taper and a set of Shimano cranks fit on it fine.

The chain side was turned with my fingers counter clockwise trying to remove it. It got tight and stopped turning. I can’t get it to losen and spin by tapping with a hammer/screwdriver in either direction. I thought I’d stop and ask before using the j correct tool with excessive force.
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Old 02-16-19 | 05:59 PM
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That side IS reverse threaded.
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Old 02-16-19 | 06:44 PM
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Thank you. I decided not to muck it up and buy a tool. In seeing it, I realized I still had my father in law’s.

I also got my chain guard installed at the same time. Unfortunately I didn’t get the cranks 180 degrees out the first time.
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Old 02-17-19 | 12:16 PM
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Originally Posted by Bill Kapaun
That side IS reverse threaded.
Unless the shell is Italian thread (36mm x 24tpi).
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