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chr876017206 wrote a question about on August 17, 2011

I am running an Ultegra SL drivetrain (RD-6600G on the back, I believe) with a CS6600 11-25 on one wheel set and 11-23 on another. I would love to put a CS6700 11-28 on one but have heard/read that my rear derailleur can not handle the 28? Is this true? Do I have to hunt down a CS6600 12-27?