Forest, OK on the PM. Around 18k I started hearing more road/tire noise, but thought it was just rough roads. I had the tires rotated left to right, during my 20k service. They mentioned nothing about tire wear, but nor did I.
The noise started getting louder so I took in to Discount Tire. They found both front tires badly cupped and the rears with an inside ridge.
Took the car back to smart, Mark said Smart warranty wouldn't cover it, but offered to send it out for an alignment and cover me with a loaner. My Cost $80. This to be done after I get some new tires installed.
My plan is to buy one new front. Have the tire from the spare (New) switched out and put on front. Have the rear tires flipped on the rims . total $152. Then take back to smart for the alignment.
If we hear of lots more tire problems with these cars we may have some recourse, so lets keep posting.

A2Jack
BTW, this forum is a backwater that many SCOA members do not read. This needs to discussed where more of our members can be made aware of this problem.