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  1. #1
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    Can I use D/A10sp ders with Ult9sp shifters?

    Slowly upgrading our tandem from 9-speed ultegra triple to 10-speed. Will 10-speed D/A front and rear deraillures shift correctly if used with my 9-speed ultergra shifters? Has anyone run this kind of combo? Thanks.

  2. #2
    Senior Member DieselDan's Avatar
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    It should. I use 10-speed 105 (5600) derailers with 7-speed RSX brifters. The derailer doesn't control the shifting, the shifter does.
    Bikes use brakes to stop.

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    Low car diet JiveTurkey's Avatar
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    The rear will work perfectly. You may get some chain rub in the front because the FD is meant for a slightly smaller chain. If the front shifter has a half-shift/trim function, that should help. It should still shift fine though.

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    You should be fine

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    Thanks guys.

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    loser
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    this might be obvious but - the deraileurs will work as long as you continue running 9 sp cassette.

  7. #7
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    Quote Originally Posted by JiveTurkey View Post
    The rear will work perfectly. You may get some chain rub in the front because the FD is meant for a slightly smaller chain. If the front shifter has a half-shift/trim function, that should help. It should still shift fine though.
    +1
    It depends on if the crankset and/or chain are 9-speed or 10-speed. You may want to stay with the 9-speed front derailleur until everything is 10-speed.

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    Actually, if you upgrade from 9- to 10-speed, the only things you need to change are:
    - chain (10-speed chain)
    - cassette (10-speed cassette)
    - shifters (10-speed shifters).

    You don't ever need to change anything else.

    Rear derailleurs will shift whatever you present them with, and front derailleurs are fine-tuned to what Shimano considers a "perfect" crankset. Since the 9-speed crankset and the 10-speed crankset have slightly different rings (40 vs 39 middle ring if I remember correctly), the new front derailleurs are shaped slightly differently. So using a 9-speed FD with a 10-speed crankset and STI shifters may result in slight rub on 1-2 extreme combinations.
    Michel Gagnon
    Montréal (Québec, Canada)

  9. #9
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    Good info. Thanks again.

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