Question: what is the difference between r and zr on tires?
Answer: What is the difference between R and ZR tyres ? ZR basically means the tyre is adapted for speeds above 149 mph. ZR tyres includes the speed ratings V(149mph), W(168mph) and Y(186mph). ... Nowadays, the marking ZR is not relevant anymore but it is still used in the catalogues of manufacturers and tyre retailers.