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I am slowly upgrading all of my drivetrain to Ultegra on my cyclocross bike, but I currently have a 9 speed rear cassette. All of the Ultegra cranksets advertise that they have super narrow rings for 10 spd chain. Can I just swap out chain rings for 9 speed variety? If so, what is the comporable brand/model chain ring I should use?

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You should only need to change the inner ring. Shimano changes the offset of the inner ring to compensate for the narrower chain. The outer ring should be fine.
 
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