I am confused about the PAX tyre codes on a bugatti veyron?

The codes are;





front tyres 265/680ZR500A 99Y





rear tyres 365/710ZR540A 108Y





Ok I think the rims are 500 and 540mm respectively, but whats is the sidewall distance? I want to find the overall diameter of the rear wheel.|||Good question! I ended up heading over to wiki and found this...





"PAX tires are measured in the metric system exclusively unlike the mixed English and metric measurements prevalent in conventional tires. For example a conventional passenger car tire might have the designation 245/45-18, indicating a tread section 245 mm wide, with an aspect ratio of 45% (i.e., the sidewall height is 45% the width of the tread section), mounted on an 18 inch conventional wheel. The similarly sized PAX tire would designated 245-680R460A, indicating the same 245 mm tread section, but a 680 mm overall diameter (a specification not in the conventional passenger car tire nomenclature), the R, meaning radial construction, a 460 mm wheel width (approximately 18.1 inches) and A for asymmetric, meaning that the wheel is asymmetric, or PAX system."





So it sounds like the overall diameters are 680mm and 710mm.|||You left the Y out of your name !?





"Porkypie"





If you own a Veyron the dealer sources all you need.|||tyres codes are usually, 265mm/ 680mm zr (speed rating)500 mm


so it'll be the middle set of numbers in the tyre





common types of tyre measurements usually read:


195(mm)/50(mm)zr(type, or speed rating)15(inches)|||680mm and 710mm respectively. PAX measurements give the actual tyre diameter in mm as opposed to the "normal" percentage of the tyre width.