Brothy Posted October 5, 2012 Share Posted October 5, 2012 After looking round for some new tyres, a friend mentioned that to make sure i get the correct size i also need to try and get the correct rolling radius as stock tyres if possible ? As in an earlier topic i will be running 18x8.5j for my fronts, can anyone help me out as regards this radius and size etc Link to comment Share on other sites More sharing options...
johnny g Posted October 5, 2012 Share Posted October 5, 2012 Search?!?! Link to comment Share on other sites More sharing options...
Dnk Posted October 5, 2012 Share Posted October 5, 2012 (edited) http://www.etyres.co.uk/tyre-size-calculator.htm Stock 17" tyre size is 235 45 17 Edited October 5, 2012 by Dnk (see edit history) Link to comment Share on other sites More sharing options...
James Posted October 5, 2012 Share Posted October 5, 2012 Stock 17s originally had 235/45/17 on the 8JJ front and 255/45/17 on the 9.5JJ rears. That equates to the front total diameter being 25.327" and the rear diameter being 26.035". For the 18s, if you went for 235/40/18 it'd give 25.402". That is pretty close. Link to comment Share on other sites More sharing options...
Lbm Posted October 5, 2012 Share Posted October 5, 2012 Moved from Tech. Link to comment Share on other sites More sharing options...
Brothy Posted October 5, 2012 Author Share Posted October 5, 2012 235/40/18 it is then, thanks for the advice Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 6, 2012 Share Posted October 6, 2012 A fabric tape measure and a bit of basic maths will tell you EXACTLY what the RR is of your tyres. Most tyre makers have the info in the tyre specs as well. Link to comment Share on other sites More sharing options...
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