I currently have 225/60-14 tyres on my car. According to a tyre size conversion chart I've got these have the same rolling diameter as the original (195 equivilant?) tyre which of course is good. I was thinking of changing to 15 inch wheels and apparently I should be looking for 225/55-15 tyres, which seem impossible to purchase. Has anyone had any luck finding this size tyre? it seems i might need to go to a 215/60-15, but iI'd really rather keep the width I already have.