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  1. #1
    Senior Member
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    9 speed to 10 speed conversion

    I am helping a friend do some upgrades on a Trek 2004 5200 outfitted with 9 speed Ultegra.
    Would like to possibly upgrade to a Ultegra 6700 5 pc group (use existing crank)

    1) Are there any issues with using the newer 10 speed chain with the old 9 speed crank (ie - tooth width, etc)
    2) What is the difference between a 6700 and a 6703 lever?
    3) Any other 'gotchas' to be aware of?

    Thanks!
    Tom
    2013 BMC TMR01 custom build, 2013 Cannondale F29er, 2012 Cannondale CAAD10 custom build
    2011 Specialized Crux, 1980 Palo Alto custom build

  2. #2
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    1. No problems what so ever. I'm currently running a 10-speed Shimano cassette and 10-speed Wippermann chain on a 9-speed Ultegra 6500 crank with no problems at all. It shifts great.

    2. The 6700 is for a double and the 6703 is for a triple crank.

    3. None I can think of except cost.

  3. #3
    17yrold in 64yrold body
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    As HillRider says, cost is the obvious drawback. I had switched from 9spd to 10spd and found I could not get the low gears I wanted (at that time). I switched back to use MTB cassette for the low gears. I have 24/34/52 with 11-32 9spd, and it works great for what I need.

  4. #4
    Kid A TurbineBlade's Avatar
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    If your friend rides competitively or just wants "gee-whiz" kicks it might make sense to go 9>10. Otherwise it's pretty pointless, since the range doesn't really change necessarily.
    Cyclist, angler and aquarist

  5. #5
    Senior Member
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    Tom, Insure the chainrings aren't too worn, as in any chain replacement.

    Brad

  6. #6
    Fred-ish rogerstg's Avatar
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    Quote Originally Posted by Gearhead65 View Post
    I am helping a friend do some upgrades on a Trek 2004 5200 outfitted with 9 speed Ultegra.
    Would like to possibly upgrade to a Ultegra 6700 5 pc group (use existing crank)
    I can only think of 3 pieces that need to be changed; the brifters and cassette (plus chain: a supply item). Unless something like a brifter is broken, it seems like a big waste of money to get one extra cog in the middle of a cassette.

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