Max69vk Posted April 8, 2007 Report Share Posted April 8, 2007 (edited) Very handy tool that opens up in Excel, this allows you to work out the difference in rolling radius, profile height & stretch of the tyre on any size rim (even gives you a visual comparison). Only down side is that its in Belgian but its simple enough to use. Just put the details of the original or current rim/tyre combo in the blue boxes, then put the new details in the red boxes, make sure you click into one of the boxes in the 'Snelheid....' area and hey presto! It shows you a visual difference between the two & the rolling radius.CLICK HEREA quick screenshot of the difference between a 195x45x15 on a 7j rim & a 165x50x15 on the same......Here's a link to a Rolling radius size calculator...http://miata.net/garage/tirecalc.html Edited February 10, 2010 by nfbr Updated link Link to comment Share on other sites More sharing options...
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