If they were flat or really low on air you could have broken a steel belt in the tire... If that happened you would notice a wobble especially over 40 mph. NEVER drive a tire with a broken belt! I would get it checked out just to be safe...
Happened to me once on my Miata when it was in storage 2 winters ago had to buy a new tire to fix the problem.
I recommend rocking the tires at least once every 2 weeks to prevent any flat spots or broken belts in your tires.
Also keep up on the air pressure I go to 40 psi now (while it's still 50' out) for storage to prevent the tries from going flat, Remember cold air molecules condense so a tire with 25psi at 65' will look like a tire with 15psi @ 0'... OF course if your going to store in a heated garage disregard adding air to the tire...
That's what I did last winter with the Mazda and the tires were in great shape for the spring! I'm going to do it again this winter too.
Last edited by Jedz123; 12-02-2008 at 10:18 PM.