[eschaider]

The Billboards' rubber supposedly deteriorates fairly quickly, Doug. Not that it has anything to do with the flat spotting induced vibration but it reportedly affects tire adhesion so be cautious when you first flex your car's muscles after sitting so long.

The flat spotting I have experienced, not with billboards, is not initially noticeable because the tire rotates slowly enough it's circumference can pretty well conform to the road surface. As vehicle speed increases and the time interval available to conform decreases the flat spot becomes more apparent. After driving for a while the flat spot seems to go away and the ride goes back to normal until it sits for a few days again.

If that sounds like what you are experiencing then it is probably flat spotting. Next time you go tire shopping check out the Avons. They are about the same price wise but are not bias ply, do not flat spot and provide comparable traction, maybe better, than the Billboard alternative.

If you like the Billboard style lettering, there are a number of third party suppliers now that offer very high quality Billboard lettering you can apply on a Saturday .