Tires: new michelons, brake rotors, toyota avalon

Question
I just had 4 Michelon Harmonies put on a Toyota Avalon(98) and noticed a vibration at higher speeds. I took the carback to have the tires rebalanced, and was told it was a engine mount. Took the car to my mechainc, he said the engine mount was could. What do you think?

Answer
Shane,

If you didn't have the vibration before putting on new tires, then the most likely explanation is the tires - either out of balance or out of round.

However, if the vibration was there before (or you were not paying attention before), then it could be anything, but probably something rotating - brake rotors, hubs etc.