@despair So I used to work at a car shop and the thing is, nobody sells .5 tires anymore. They're all custom order, car or truck. Furthermore it's a common meme at those shops that trucks are the one thing you can ignore factory PSI and tire size on because truck owners are always using aftermarket rims that do not use factory sizes at a higher rate than normal car owners do.

They all use the Metric sizes now for new cars/trucks and 90s ones at least, domestic and import.