1. no. manufacturer will state if disc only
2. size is limited to the width your frame will allow, assuming you have canti brakes, you may squeak a 700x38, but no larger. the wheel may recommend a tire size but . . .
3.the most expensive is not the best.
4. open to debate, I don't feel like opening that bag of kittens, except to say the most expensive is not the best.
advice= 23's are fast, flimsy and brutal. 25's are fast, less flimsy and forgiving. 28's are forgiving and good for off-roading and commuting. 32's are good for off-roading, cyclocross and usually knobbies. I use a 38 for snow and ice and it barely fits my Bianchi.
Last edited by Rx Rider; 04-15-12 at 09:47 PM.