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  1. #1
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    Jan 2010
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    Shimano rd-7700 compatibility

    Hi

    Like to upgrade my back Shimano 600 Ultegra RD 7 speed double,
    and just wondering if I replace it with a 9 or 10 speed rd-7700-7800 will their be any issues.
    Still keeping my 7 speed casette.

    Cheers!!

  2. #2
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
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    The only problem that I can think of would be the width of the cage. The 7-speed chain might not have as much clearance with the narrower cage. Actually I believe it would work fine but I would go for a 7700 instead of a 7800 if possible. You could also try a narrower chain. I'm pretty sure you could use an 8-speed or 9-speed chain with your 7-speed drive train. I have see a 9-speed Shimano chain work perfectly on a 7-speed Shimano drive train with a triple crankset.

    Al

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