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  1. #1
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    chain line dimension on BB question

    2006 specialized P3

    if im ordering a replacement bottom bracket, its a Truvativ Howitzer Team BB

    but it comes in two options for my shell width - a 51 chain line and a 56 chain line (i assume this is mm).

    how much does this dimension matter?

  2. #2
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    If you have the old cranks still installed, you can measure the chain line you currently have:
    - All About Bicycle Chainline

  3. #3
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    i actually saw that same article, i dont have the bike accessible to me right now though

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