On my 10 speed dale' I went with a compact crank with a 11-28. With a 12 speed cassette they can keep a full size crank and still climb serious hills AND get the speed on the flats. NOT that I could but those who race often. I know some on here DO race, did you guys (or gals) find much change going from 9 to 10 or even 11 speed cassettes?