Have any of you heard of this? The guy at the tire place said that 2 of my rims are out of balance. I have had the tires replaced 3 times now in the last 2000 miles. This last time the tire guy put the rim on the balancer before putting the tire on to figure out why the tires keep ending up out of round. One of the rims is .50 OZ on the inside and .75 OZ on the outside. So the tire place is blaming the manufacturer (chevrolet), and the dealership is blaming the tire manufacturer (2nd and 3rd set of tires were Firestone Firehawk SS20's, and the 4th set are Bridgestone Potenza RE910"s).