Do not believe in hearsay. Go to the NHTSA web site
Scroll down the page to #119, which is the test now used by the tire industry.
The new tests due to take ffect soon are a bit farther down the page. Their Number is #139.
Be empowered through information. You remember, "the truth shall set you free".
Finally to all fellow streamers and rv owners who read this site for information, keep records on your tires, original receipts, these have the DOT number branded into your tires.
Go to the web site
in the center of the page you will find the phrase "Recalls Search From Office of Defects Investigation"
Select this and follow the directions and file complaints when you have a tire failure. It only takes a few for the office to take notice(10 to 20 a month) and the Govt will purchase these tires from unsuspecting merchaqnts and test in accordance with their requirements.
Email the engineer Mr Gellispe and ask him questions. He is the authority. He is responsible for these tests.
Remember, Speed Rating is a European concept driven by the Autobahn and the need for tires that would survive the speeds driven there.
American Tire Manufacturers adoped the testing criteria as an advertising ploy to show how gook their tires are.
The Speed Rating on the tire is the overall acid test of how much heat the tire will withstand. If a tire at 100 degrees F. at full load will withstand 99 MPH then is will withstand 65 MPH at what ever the temp happens to be with a wide safety margin.
A tire with no Speed Rating is tested at 65 MPH max, under full load as stated on the sidewall, after being allowed to being heated to 100 Degrees F.
This means simply this, if you are towing your unit and:
1. The pavement temperature exceeds 100 Degrees F, you have exceeded the proven limits of the tire and are damaging the tire and it will not recover from this, only be weakened.
2. If you ever exceed 65 MPH for any reason you have exceeded the proven limits of the tire and are damaging the tire and it will not recover from this, only be weakened.
Please, don't take what I have said here at face value.
Go to the web sites and read and understand for yourselves.
Email Mr. Gellispie, he will answer you.
Call Mr. Gellispie, he will return your calls and talk freely with as much as he is allowed to.