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Ya learn something new every day

Old 10-07-11, 05:49 AM
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Myosmith
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Ya learn something new every day

I was stripping down a used bike for a complete rebuild when I had one of those "What the hell ???" moments. When I got to the bottom bracket, I started to remove the drive side when I realized that instead of the bottom bracket, I had the plastic cup. I had never encountered this before and wondered if someone had actually been able to install the BB backward even though the threads are in opposite directions

To top it off, the BB is frozen really solidly into the shell. I went to the Park Tool site and learned something new http://www.parktool.com/blog/repair-...et-service-bbt Shimano made two versions of their cartridge BBs, one with the cup on the left (the way I had always known it) and one with the cup on the right. Who'da thunk?

Are these right-side cups common? I've never come across one before.
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Old 10-07-11, 07:45 AM
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I've heard of them but never came across one myself either. BTW, always remove the "metal" side first. Trying to remove the plastic "cup" first usually winds up breaking it.
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Old 10-07-11, 11:23 AM
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Yep, I always remove the BB "metal side" first, which is why I was starting on the drive side as in every other bike I have worked on, that is where the BB has threaded in. In this case both the plastic and the BB are black and were kind of dirty/greasy, so I didn't realize that I had the plastic cup until I had backed it out a couple turns.

The BB itself was really stuck so I put the frame in the stand so that the BB was down and ran some Liquid Wrench in from the other side and let it sit overnight. It was still really stuck this AM so I ended up disassembling the BB while it was still in the frame and running a 3/8 bolt through the stuck BB housing and the removal tool so that I could put some muscle to it without the risk of slippage. I really wish they'd make those slots a little deeper for times like this. It worked, BB is out and the build is proceeding.
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Old 10-07-11, 11:34 AM
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I saw it only once, it was an Italian thread BB with the metal side intended to be on the left side, but installed the wrong way. The spindle was seized due to the nut self tightening over use.
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