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  1. #1
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    BB spindle lengths

    I just aquired a new road bike from a friend which has a triple chain ring front. I am wanting to change it to a double that I have laying around and need to know if I should change to a shorter BB spindle length. I currently have a 118 with the triple. What length would be suitable for the double (older Shimano 105)? Thanks.

  2. #2
    Senior Member acape's Avatar
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    I don't think you can use that bottom bracket with a double. I just purchased a 105 double crank and bottom bracket, and the spindle length for the double is 109.5 mm.

  3. #3
    cab horn
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    You most likely will have to change the bb to something like a 107. The specific lenght depends on which crankset you buy.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  4. #4
    Elitist Troglodyte DMF's Avatar
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    Is it a square taper BB? Have you measured the front chain line? Nominal on a triple is 45mm. Nominal on a double is about 42mm. But if it's a square taper, it's hard to predict how a different crank set will fit.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  5. #5
    Senior Member capwater's Avatar
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    If the cranks are square taper, pick up a Shimano UN-53 107mm spindle length which is proper for a double crankset.

  6. #6
    Senior Member
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    Yes, it is a square taper. I'll look into the UN-53 107, thanks.

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