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  1. #1
    ELVEEPEE elveepee's Avatar
    Join Date
    Dec 2005
    Location
    Lordsburg, NM
    My Bikes
    Trek Mountain Track 850, Bridgestone XO-3
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    I am rebuilding the above bicycle. When the LBS took out the bottom bracket it was the old style, not a sealed unit. It measured 123 mm in length. They had a 122 mm Shimano sealed unit and I planned to use it. Today, when we were installing it, it became apparent that the inner chain ring would now interfere with the right chainstay. I have read that some of the older bottom brackets were longer on one side than the other, I assume to alleviate the above mentioned problem. We have ordered a 127 mm bottom bracket hoping that the inner chainring will then clear the chainstay. Does anyone know if there are sealed bottom brackets that are built with a longer crank portion on the right side to address my problem? If so make, model, availability, supplier, etc. Project on hold!!
    My other bike is a mule

  2. #2
    Senior Member mtbikerinpa's Avatar
    Join Date
    Dec 2004
    Location
    PA
    My Bikes
    92 Giant Sedona ATX Custom
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    So far as I have run into, the sealed units are made to a fairly consistent program of offsets. The old style were too, but since they are flippable it can lead to some confusion on the matter. If in doubt, a good shop should be able to tell you what size/type you need without much trouble.
    Aviation Mechanic, Bike racer, Fitness Equipment Restorer

    http://pedalmybike.com/userTrackies/myTrackie4758.jpg[/url]

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