Sure, I understood the normal convention like SR, HR, VR, and I even knew ZR meant "beyond" 149. A WR tire can put ZR on the sidewall though. The service descriptions had me all messed up. I knew my new tires were WR rated somehow due to the service description of 91W, even though the sidewall says 235/40ZR18 91W. For the longest time I was like WTF is a 91W? Duh, 91 represents the load rating and W is WR. 91 is below the stock 215/55-HR16 RS-A which are 93H. Interesting the RE950 in the same size are 91H meaning they also have a lower weight capacity. Dang if I had a million $ I'd be riding on the Michelin Pilot Sport A/S, 235/40YR18 with that crazy 3 compound tread mounted on Evo5's......

 

buy the nappy roots cd called 'watermelon, chicken, and grits'