hbillsmith wrote:
TxGearhead wrote:
I could be all mixed up on this, but I THINK I have read that there is a different import duty on ST tires vs. regular vehicle tires. I believe I read that Sailun just re-branded the S637 tires to ST to avoid that. But I could be way off base on that.
You are correct on the import duty. Sailun markets two similar tires, close but not exact. The S637 is sold as an LT235/85R16 that is LT branded and has 2/32 more tread depth than the ST variant (12/32 vs 10/32). The S637 last year became available as a "Special Trailer (ST)" tire ST235/80R16. Both variants are "G" load rated, have a max speed of 75mph, and require metal stems and a wheel certified to 110psi.
It is not always simple to determine the psi rating of your wheels. Some are simply stamped with a load rating. A call to the wheels mfg. does not always get consistent results. For instance, my Forest River has HiSpec Series 9 Aluminum 16" wheels and when I called I was told they are good up to 80psi. Another owner called HiSpec and was told the very same wheel was good to 110psi as long as you added metal stems.
I don't know what to think about wheels. I have Tredit TO3. I called them to ask about PSI rating. First answer was "I don't see anything here about max PSI". OK, I think I need to talk with someone else. She said: "Do not exceed 80PSI they could fail". Etrailer sells a wheel that looks just like a Tredit TO3 with higher ratings. I can't imagine there are several different wheel factories in China producing wheels that look exactly alike with different PSI ratings. I'm going to err on the side of safety and stay at 80 PSI until I decide to spend $500 on different wheels.
