showtime1 Posted July 5, 2010 Posted July 5, 2010 need some rear tyres soon, im gonna go with 255/40/18 as the avon zz3 is quite narrow compared to other makes. keeping my fronts standard as theres quite a bit of life in them. anyone done the same feedback appreciated. Quote
terribleone Posted July 5, 2010 Posted July 5, 2010 Going from 245/45s to 255/40s reduces your rolling circumference by 2.43%. Not a huge difference, normally it's recommended to stay within 2.5%...If I was going up to 19s for example, I'd rather be going bigger than smaller on circumference on these cars as the rear tends to sit higher than the fronts so you'd lose a bit of that arch gap. [Edit] Just ran 255/45s through a tyre calculator...they're only 1.33% bigger. Diameter works out about 9mm bigger, 4.5mm less arch gap but will sit 4.5mm higher. Quote
showtime1 Posted July 5, 2010 Author Posted July 5, 2010 thats not to bad i found a calculator they say stay within 2% which it is so i think i ll go with the 255/45/18 ,not bothered about the gap as i might get some eibach springs Quote
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