Independent, free tools for Australian drivers. No signup, no email capture, and no shopping cart at the end of them. Each one exists because the answer was harder to find than it should have been.
Tyre size calculator
Compare your factory wheels and tyres with the ones you are considering. See the real change in overall diameter, speedo error, poke, track width and gearing, then check the whole package against VSB 14, ADR 18 and the rules of your state before you spend anything.
