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Old 12-14-09, 07:41 PM   #1
Torelli4
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Shimano bottom brackets symmetrical?

I spent an hour or so in the archives but wasn't able to find a straight answer. I also checked the Shimano website. Are Shimano square taper sealed bottom brackets symmetrical?(specifically UN54) Example: To move my chainline in 4mm I'd have to go from a 115mm to a 107mm. Thanks.
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Old 12-14-09, 09:12 PM   #2
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That is correct.

Note 110mm = 107mm in terms of chainline.
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Old 12-15-09, 02:27 PM   #3
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I just measured most of the bottom brackets on hand here at the store:

http://blog.harriscyclery.com/relati...ttom-brackets/

Some of them aren't actually symmetrical, but your assumption re: 115mm vs. 107mm is correct.
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Old 12-15-09, 05:23 PM   #4
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Thanks.
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Old 12-15-09, 09:37 PM   #5
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I'd started some threads and gotten a bunch of measurements on Shimano square-taper BB's awhile back, but don't remember what was what. You can search for threads started by me, with "bottom bracket" in the thread title.
I do remember that 107 is symmetrical and 110 isn't (having 3mm longer non-drive-side extension) as operator notes.
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