grampadirt
02-21-2010, 04:17 PM
After reading Matt_'s tire thread I gave my GYs a closer look and found that they have an ''R'' speed rating.Did a little search and found this list.I know some members have some fast cars so maybe it might help someone when buying performance tires.Check out the paragraph after the list,pretty funny
-M: 81mph or 130 km/h
- N: 87 mph or 140 km/h
- P: 93 mph or 150 km/h
- Q: 99 mph or 160 km/h
- R: 106 mph or 170 km/h
- S: 112 mph or 180 km/h
- T: 118 mph or 190 km/h
- U: 124 mph or 200 km/h
- H: 130 mph or 210 km/h
- V: 149 mph or 240 km/h
- Z: in excess of 149 mph or 240 km/h plus
- W: 168 mph or 270 km/h
- Y: 186 mph or 300 km/h
You will notice that the Z rating is for speeds in excess of 149mph or 240km/h, but there are two different ratings below it. When Z rated tires were introduced, there was a lack of street legal autos that were able to obtain speeds that high or higher. Hence, it was believed that future vehicles would be unable to or would be manufactured so that they could hit those break neck speeds. However, as we know now, there are countless vehicles that can easily zoom past 149mph or 240 km/h, especially autos classified as exotic cars. This is why the W and Y ratings were eventually introduced.
-M: 81mph or 130 km/h
- N: 87 mph or 140 km/h
- P: 93 mph or 150 km/h
- Q: 99 mph or 160 km/h
- R: 106 mph or 170 km/h
- S: 112 mph or 180 km/h
- T: 118 mph or 190 km/h
- U: 124 mph or 200 km/h
- H: 130 mph or 210 km/h
- V: 149 mph or 240 km/h
- Z: in excess of 149 mph or 240 km/h plus
- W: 168 mph or 270 km/h
- Y: 186 mph or 300 km/h
You will notice that the Z rating is for speeds in excess of 149mph or 240km/h, but there are two different ratings below it. When Z rated tires were introduced, there was a lack of street legal autos that were able to obtain speeds that high or higher. Hence, it was believed that future vehicles would be unable to or would be manufactured so that they could hit those break neck speeds. However, as we know now, there are countless vehicles that can easily zoom past 149mph or 240 km/h, especially autos classified as exotic cars. This is why the W and Y ratings were eventually introduced.