75mph ST tire

RinconVTR wrote:
.....snip......


I can tell you the answer right now to save you time;

You dont know what any given manufacture tests to. That is propitiatory information you wont find on the internet......snip

Actually, in order for a tire to be used on US highways, it must be certified to DOT standards. Based on that, we know if a tire has DOT stamped on the sidewall, the tire manufacturer is certifying it meets those testing standards. The specific standards have been spelled out numerous times on this forum in threads outlining the differences in test standards. A search and some reading here on the site will find those discussions. Or you can find the testing standards on the internet.
The following is a very simplified explanation of part of the DOT certifying requirement, taken from the tire rack website:

"Because not all tires are intended to be imported and sold in the United States, many tires are developed and produced without being tested by their manufacturer to confirm they meet all U.S. Federal Motor Vehicle Safety Standards (FMVSS). Without conducting the tests and certifying these tires meet U.S. requirements, these tires are not allowed to be branded "DOT" (shown below) and cannot be legally driven in the United States."

EDIT: A little followup here. The reason I started this thread was to illuminate one aspect of this whole discussion. And that is speed rating. If a tire manufacturer desires to built a product that exceeds the relevant requirements, they certainly may do so. The regs state they must meet "minimum requirements". In the case of the tire I referenced in the first post of the thread, I was pointing that here was one tire ( with photograph to "prove" it ) that we can see exceeds the normal speed rating for these tires. Speed rating is one of the requirements that tire must pass in order to earn a DOT approval.
I offer this up, because there are those who, for various reasons would like to use ST tires on their trailer, but sometimes lament the fact they have a lower speed rating. Here perhaps is a tire that might meet their particular choices.