Just wanted to add my 2 cents. Stay away from the XTR cassette. It had the worst shifting qualities out of any cassette i've ever used. And that includes about 5 different models of Shimano cassettes and 3-4 different models SRAM. After 1 month of riding with the XTR, the middle ring sheared off the cassette (rivets busted) and finally killed it. XT isn't too bad but still prefer SRAM and really dont see any reason to use Shimano cassettes again unless they come out with something new.