the reason i need tires is because 4 days ago the wife had a blow out on one of the front ones. so i look at the others and although two weren't bad tread wise i see a few cracks in the sidewalls and decide might as well replace all of them. i now have to get them mounted. i have to admit i didn't take the advice of those here and went with the customer surveys from tire rack and got the sumos at sears. we'll see how they go, or don't go, in a few days.