ROCHESTER, N.Y. — A tour operator whose bus crashed in upstate New York says the vehicle’s front tires were only a couple of months old. One of them evidently blew out and sent the bus veering out of control off an interstate, killing two people and injuring 35. Dan Ronan of the American Bus Association, speaking for Bedore Tours, says that a federal inspection last year gave the firm a “satisfactory” rating, the top of three grades.