I had an Ultegra 9-speed triple derailleur and then switched to a 52-38-30 setup (I bought a TA middle ring). Shifting was bad and it was hard to eliminate chain rub in the middle ring since the derailleur was designed for a 10-tooth difference. The cage gets narrower below the level where the chain would be on the 42T chainring.Al1943 said:The Ultegra 9-speed tripple front derailleur is designed to work best with a 10-tooth differential between the big and middle rings. The 9-speed triple Dura-Ace derailleur was designed to run with 30-39-53 rings. I believe I'd try staying with the 52.