In order to work the tyre calculators, I guess I have to compare every new dimension with the factory's initial one, and not my previous one, isn't it?
My car came from factory with 165/13 tyres. Afaik, when the profile is not mentioned, it is meant to be 82. Am I wrong?
However, tyre calculators do not have this number, they just have 80 and then go to 85...
Can anyone help?
