Guest mark09 Posted July 31, 2006 Share Posted July 31, 2006 hi, just gota new car and want to put some 18s on it, what tyre size do i want for my 73 crown with 18s to keep the rolling diameter the same for my speedo, thanks Quote Link to comment Share on other sites More sharing options...
Toucan Posted July 31, 2006 Share Posted July 31, 2006 http://www.tyremaster.com.au/fitment_tips/diam_calc.htm Something like that should work it out for you. Just wack in your stock tyre sizes then try some 18" sizes to see if any give you a similar value Quote Link to comment Share on other sites More sharing options...
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