GreenAutos. Not a bad idea. I'll keep my eye on ebay. Not a bad idea to keep a couple hanging around. Unfortunately, ATM I live in an apartment and storage is at quite a premium. Tires are about last on my list to store.
Geezer. Maybe it was the balancing then and not the bar that caused the cupping. All I'm sure of is that the tread depth on the outside of the tire was about 5/32 and the inside was 3/32. And that was only on the drivers rear. They did do a 4 wheel alignment and it was way out of whack. They gave me a print out, but of course that's gone into my repair folder at home and I'm not.