you're clearly out of your element if you are using XTR and 9.0 as examples in a thread about road bikes. you should be asking about dura-ace, ultegra, force, red, record, or chorus. second, I busted my XTR shadow rear hanger and deraileur last week, but thats because I smashed it on a rock rather hard, good thing its under warrantee..
I don't know why I'm defending fixed riders, seeing as I hate most of the hipsters myself, but it is really fun to ride, you just gotta try it