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  1. #1
    Seek the Joy
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    what good does alternative cable routing do?

    http://sheldonbrown.com/dura-ace.html

    So, Sheldon, (or anyone who knows realy) explain how bending a cable up through the pinch bolt instead of going right through changes anything about compatibility.

  2. #2
    hello roadfix's Avatar
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    It alters the derailleur's pull ratio.

  3. #3
    biked well well biked's Avatar
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    By moving the point where the cable is anchored, you change the distance the derailleur moves when you pull the cable a certain amount. In other words, when you move the shifter one click, the different anchoring point causes the cable pull to have a slightly different affect; in the case of alternate cable routing, it causes the derailleur to move slightly further with each click of the shifter-

  4. #4
    Senior Member Retro Grouch's Avatar
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    Let me say it another way:

    If you anchor the shift cable closer to the pivot the same amount of cable pull will move the derailleur farther. It doesn't take very much to make a difference.

  5. #5
    * vpiuva's Avatar
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    The old DA shifters pulled less cable/shift, so this routing pulls enough cable for you to be able to use the other model RDs w/early DA shifters.

    Too bad it's not the other way around. Plenty of old DA RDs around, just not enough 7&8s DA shifters

  6. #6
    Year-round cyclist
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    Quote Originally Posted by vpiuva
    Plenty of old DA RDs around, just not enough 7&8s DA shifters
    Use a 9-speed shifter with your 8-speed DA derailleur. Spacing of all Shimano 9-speed rear shifters (DA, Ultegra, 105, mountain...) is identical to the spacing of 8-speed DA shifters and derailleurs.
    Michel Gagnon
    Montréal (Québec, Canada)

  7. #7
    * vpiuva's Avatar
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    Quote Originally Posted by Michel Gagnon
    Use a 9-speed shifter with your 8-speed DA derailleur. Spacing of all Shimano 9-speed rear shifters (DA, Ultegra, 105, mountain...) is identical to the spacing of 8-speed DA shifters and derailleurs.
    I know, just not quite correct when you're anal on a resto

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