For all sorts of car related data and is not guaranteed 100% perfect but is capable of your general needs
Click the image below (its not an actual window) to initiate Download
Please accept the ZIP file download 21KB filesize (TINY!)
Full credit to Stephen Penney [Author] and original link (I have lost) from NissanSilvia forums in AU for file origin
please report any problems with the file to me
I still use this
edit : dang doesnt appear to work / load on my work Lunux Machine, oh well there always google & online tire size calculators unless someone has a link to a sweet android app? (cos iPhones suck)