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  1. #1
    Junior Member
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    Deraileur tab position

    From center of BB. Where should this be for standard road position? Anyone got one they can measure?

    Thanks in advance!

  2. #2
    Randomhead
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    i don't think we usually call it a derailleur tab. What is it that the derailleur tab does?

    Are you talking about the front derailleur bracket braze-on? If so, that's a little tricky, and you have to decide what range of chainrings you are going to accommodate. Shimano and Campagnolo both have technical drawings for their front derailleurs

  3. #3
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    I often call it a derailleur tab.

    Take a look at the published spec, as well as the dimensions of your particular braze on and balance those with the gearing range for the crank sets you hope to use.
    --
    Eric Estlund
    Winter Bicycles

  4. #4
    Randomhead
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    depends on if you want to use both a 53 or a 50 (144 looks good), or if you think you will only ever use a 53 (146mm will center with a 53). These are shimano numbers. Campagnolo is a bit different.

  5. #5
    Senior Member
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    for a typical outside ring of 53t the center to center measurement is 148mm-150mm.
    it also depends on the changer you are using atmo.

  6. #6
    Framebuilder
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    Many Shimano specs and tons of good info from Peter Verdone here:
    http://pvdwiki.com/index.php?title=S...mebuilder_Info

  7. #7
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    Perfect thanks.

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