I ordered some new tires today. I went to the tire store and told them what I wanted. They were a little concerned that I wasn't getting the proper tire because the speed rating was incorrect for my vehicle. Now, I will preface this with these are tires for my car in the USA. I will most likely not be driving it on an autobahn. Once you have an H rated tire..does it really matter all that much? They wouldn't have said anything for a Z rated tire (over 149), but they were concerned that I was buying a Y rated tire. Then this has me wondering, what is after a W rated tire? I may have to use some google fu. But I still find it ironic that tires have a speed rating so much over the speed limit.