Subject: RE: Question about crank compatibility Good question. While the DuraAce 7800 and Ultegra 6700 series is for 10 speed, I am using a Shimano R700 crank (it's the Ultegra 6600 level, but for high end flatbar bikes) with a 9 speed chain and 9 speed cassette. It works well. What you may notice in the inner chainring - small cog gearing (called cross gearing) the chain rubs against the outter chainring a little more than a full 10 speed drivetrain would. Avoid using the cross gear combination and the sound will go away. The outer chain ring and a more central cog will provide a similar gear ratio. Edited by Six000MileYear 2012-04-05 9:22 AM
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