The tire service is a joke. If you buy tires figuring Costco will stand behind them then you need to read the fine print. They will look for any way to screw you out of the warranty! Rapid or irregular wear is one of the things they don't cover, which is of course your fault for driving your car. Or maybe it was just my fault for buying tires at Costco instead of Discount Tire where I always have in the past!