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  • Donating Members
  • Member For: 18y 1m 28d
  • Gender: Male
  • Location: Sydney

Here you go, here you can see how your rolling diameter and speed will change with different tyre/wheel sizes...

http://www.miata.net/garage/tirecalc.html

Edited by dule
  • Donating Members
  • Member For: 18y 1m 28d
  • Gender: Male
  • Location: Sydney

And in NSW it's only legal to go one inch above the largest wheel size shown on the tyre sticked on the door seal.

  • 2 weeks later...
  • Member
  • Member For: 16y 3m 16d

This link should be made sticky

http://www.infrastru...n_2011%20v3.pdf

In short, what has already been mentioned about rolling diameter is true.

Regarding width, it is 1.3x the widest TYRE offered by the manafacturer for the model, so for the Falcons it is 245x1.3 = 318.5 or 315.

The widest rim that is listed for a 315 is 12.5".

Edited by winstor

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