ADD Posted October 11, 2005 Share Posted October 11, 2005 just been studying my wheels and noticed i have on the front 235/40/zr18 but on the rear 265/35/zr18.......is this normal? i would have thought that i would have 40's on the rear like the front!!!!!! anybody help? Quote Link to comment Share on other sites More sharing options...
Jake Posted October 11, 2005 Share Posted October 11, 2005 The aspect ratio is a percentage of the width. So a wider tyre requires a lower aspect ratio to maintain the same rolling radius Quote Link to comment Share on other sites More sharing options...
Bob Posted October 11, 2005 Share Posted October 11, 2005 Same as I have mate. Quote Link to comment Share on other sites More sharing options...
ADD Posted October 11, 2005 Author Share Posted October 11, 2005 ok that brilliant thanks Quote Link to comment Share on other sites More sharing options...
scooby_doo_do Posted October 11, 2005 Share Posted October 11, 2005 Yep, same as mine, i have 265 35 18's on the front and 285 30 18's on the back.. I always wondered why as well.... Quote Link to comment Share on other sites More sharing options...
ellis Posted October 11, 2005 Share Posted October 11, 2005 The UK standard wheels are 235/45/17 at the front and 255/40/17 at the back so that difference you have should be right to keep the rolling radius the same! Quote Link to comment Share on other sites More sharing options...
garethr Posted October 11, 2005 Share Posted October 11, 2005 You can play with this to see all the various equivalent sizes http://www.powerdog.com/tiresize.cgi There are several calculators on the web, but this one lets you compare different tyre specs. . Quote Link to comment Share on other sites More sharing options...
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