[ntrylvl]

My recently-purchased '86 Targa has Yokohama AVS ES100 tires on it. Although the tread on all 4 tires appears to be relatively deep, I noticed some road noise from the rear when coming to a stop, so I checked and found that the sidewall of my left rear tire is noticeably out of round in a couple of spots.

Could this be because the tires were left flat at some point for an extended period of time, or is it more likely that this is just an imperfection in the tire? I'm assuming the former, and that the tires are also several years old, but I cannot figure out how to determine the manufacture date on these particular tires.

Any thoughts and/or experiences would be appreciated.

Thanks.

Chris