Goodyear Endurance
Well, I borrowed a tilt/flatbed trailer to haul a car from California to Nashville Tennessee and bring one back. Prior to leaving I did quite a bit of "road ready-ing" on the trailer. I thought ab...
Forum Discussion
mike-s wrote:Huntindog wrote:What "govt. mandated performance specs?" Citation needed.
I am not certain that an ST tire with a higher speed rating has to pass any of the govt. mandated performance specs.ktmrfs wrote:Again, if you're referring to "test stds.", you need to provide a citation. But, they're simply adhering to industry standards.
Now for the mfg that don't stamp the tire but have a link on the website talking about increasing speed rating by derating the load, that I would agree is highly suspect that it would meet the test stds. If it did why wouldn't they stamp the tire- from the TRA.
one difference is that the goodyear endurance does NOT need any inflation adjustment or carrying capacity reduction above 65mph. the load rating is the same as other sized ST tires and applies all the way up to 87 mph.
Does this make the endurance any better than other ST tires? who knows. but at least the endurance has sidewall markings indicating a higher speed rating than other ST tires. Only time will tell about the quality of the tire.
But I'll bet in the next year or so we will find more ST tires going through the additional testing to be able to stamp a higher than 65mph speed rating on the tire.
NHTSA has a pdf of the testing required for tires. some 80 pages of test requirements including the testing for speed rating etc. etc.
