there was alot of road noise and shaking in my front end and was worried my bearing was shot, or the car was just unaligned... but neither of those made sense. the car only has 30k miles on it. so, once i got done checking through everything i could, i put the wheel back on and noticed a pretty large (2 inches wide by .5 inches tall) bubble pertruding the outside wall of the tire. just as an experiment, i put the wheel with the bubble on the back and the noise and rattle definately went to the back with it. is it time to replace the tires or can it be fixed?