I have at least 3 tire wear bars showing on the rear but none on the front. I tried to order on tire rack and they suggested I get an entire set. It just does not make sense to me to order an entire set if I only need to replace the rear tires at 20K miles. Of course, the need to replace has to do with overinflating the tires during autocross racing but do I really need to order all 4? Any thoughts or suggestons would be appreciated. I have noticed very obvious squiggle on take off and lane changes lately due to the balding rear tires. Kind of fun, but not so safe. :jester I think Buffy (our former autocrosser) would probably have the best advice on this or Freezer (our retired engineer and resident expert on the SSR).