I know the ContiSports have a reputation for being noisy. What kinds of noises did you guys get when they started to get bad? I'm getting a grumbling noise between 10-20Mph and a thrumming at highway speeds, especially in turns. It could also be a wheel bearing, but I don't think so. The noise seems to come and go with different pavement types so I'm leaning towards tires. What are your experiences with these? Oh and my rear tires are new (6000 miles on them). The fronts are the ones I suspect are going bad.