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  1. #1
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    '02 Superlight BB question

    Building up a used 02 SL for a friend and am running into a bizare BB/crank issue. SC states that it is a 68X113 BB that is needed. Once installed, however, the LX Hollowtech crank is pulled into the BB shell without ever becoming tight. We put a spacer on the side for now but it pulls the non drive side in just a little too close for comfort. Called LBS and they said yead it needs a 68X121 or 125 spindle length? Doesn't really make any sense. I have never even heard of those spindle lengths. We are using a BB-ES71 68X113 and 03 LX Hollowtech cranks which are definitely a different look than my 02s.

    Any suggestions?

  2. #2
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    Quote Originally Posted by FrontRanger
    Building up a used 02 SL for a friend and am running into a bizare BB/crank issue. SC states that it is a 68X113 BB that is needed. Once installed, however, the LX Hollowtech crank is pulled into the BB shell without ever becoming tight. We put a spacer on the side for now but it pulls the non drive side in just a little too close for comfort. Called LBS and they said yead it needs a 68X121 or 125 spindle length? Doesn't really make any sense. I have never even heard of those spindle lengths. We are using a BB-ES71 68X113 and 03 LX Hollowtech cranks which are definitely a different look than my 02s.

    Any suggestions?
    The 03+ LX Hollowtech requires the ES-51 bottom bracket. In order to further differentiate the differences between the levels Shitmano downgraded the bb on LX. The ES-71 is no longer compatable. It's the same spline pattern as the ES-71 but the chainline is different. You will need the 68x121. The good news is the LX is cheaper.

    http://www.jensonusa.com/store/product.aspx?i=BB708B05

  3. #3
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    Thanks Homebrew........

    for the info. The BBES51 is offered in lengths from 113-125 according to Shimano's site. SC stated 68X113 the other day. Do you still recommend a 121? Should spindle length vary between a LX and XT BB?(i.e. a XT 113 is shorter than an LX 113)

  4. #4
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    Quote Originally Posted by FrontRanger
    for the info. The BBES51 is offered in lengths from 113-125 according to Shimano's site. SC stated 68X113 the other day. Do you still recommend a 121? Should spindle length vary between a LX and XT BB?(i.e. a XT 113 is shorter than an LX 113)
    You need to use the 121 ES-51 with the M752 LX cranks (fat arms) to get the same chainline as the recommended 113 ES-71 with XT cranks (approximately 48mm).

  5. #5
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    Quote Originally Posted by Homebrew
    You need to use the 121 ES-51 with the M752 LX cranks (fat arms) to get the same chainline as the recommended 113 ES-71 with XT cranks (approximately 48mm).
    Thanks again for the info. I will let him know.

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