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  1. #1
    Senior Member Torelli4's Avatar
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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.
    Mike
    2012 Motobecane Le Champion Ti Heat
    1995 Torelli Corsa Strada
    1985 Centurion Elite RS Fixed Gear

  2. #2
    cab horn
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    That is correct.

    Note 110mm = 107mm in terms of chainline.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
    nice idea, poor execution
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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.
    Kevin Duffy, Harris Cyclery, West Newton, MA.
    blog.harriscyclery.com

  4. #4
    Senior Member Torelli4's Avatar
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    Thanks.
    Mike
    2012 Motobecane Le Champion Ti Heat
    1995 Torelli Corsa Strada
    1985 Centurion Elite RS Fixed Gear

  5. #5
    me have long head tube TallRider's Avatar
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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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