I'll have to weigh mine to see how the good years are doing---of course -is the air in them better? or worst?(sounds like an eye exam?)don't remember where I mounted them

One year at Indy Nationals---a quick rainstorm came over--we rolled the dragster into the trailer up to the rear slicks( trailer was built for car with 11 inch wheels--since we had 13 wheels that we put on after getting car out, we couldn't get it back into the trailer ===tire side walls were foaming like a mad dog from so much seepage thru the sidewalls