Shimano bottom brackets symmetrical?
12-14-09 | 07:41 PM
#1
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Junior Member
Joined: Jan 2005
Posts: 121
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From: Slower Lower Delaware
Bikes: 1995 Torelli Corsa Strada & Wabi Classic
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.
12-15-09 | 02:27 PM
#3
nice idea, poor execution
Joined: Oct 2009
Posts: 395
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From: West Newton, MA
I just measured most of the bottom brackets on hand here at the store:
https://blog.harriscyclery.com/relati...ttom-brackets/
Some of them aren't actually symmetrical, but your assumption re: 115mm vs. 107mm is correct.
https://blog.harriscyclery.com/relati...ttom-brackets/
Some of them aren't actually symmetrical, but your assumption re: 115mm vs. 107mm is correct.
12-15-09 | 09:37 PM
#5
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.
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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"c" is not a unit that measures tire width
"c" is not a unit that measures tire width
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