Originally Posted by CaptnJohn
Good info. Sadly there are few choices and I'm not aware of any US made ST tire. There may be a huge market if a company would begin. My new 5er came with Trailer King ST tires and will be changed at 4000 miles. I read recently of Power Max just being changed after 30,000. Agree with the article no matter what you run they must be taken care of or will not last. Who knows how the delivery guy took care of them in 1200 miles from the factory in IN?
That's a big IF and unless you were there to check the tire pressure when the unit first rolled in at delivery you really don't know if or how the tires were abused.
Think about this...a Goodyear or Michelin tire installed on a biz jet is required to be replaced if it has one landing with a pressure found to be 20 percent low. Even worse, if the tire is 30 percent low and it's on a dual wheel/tire setup (about 90 percent of them are) then BOTH tires must be replaced. This is true even if the tires are brand new and only used one time.
Most of these tires have a normal inflation of 170-220 psi, so 20 percent is a lot of air. But, if we apply the 20 percent factor to a trailer tire rating of 65-80 psi you'll see there could be damage if the tire is operated 12-16 psi on the low side. That's a little extreme bit of caution and, unfortunately, the tire makers won't tell us the minimum limits. But, I guarantee you that if I check my tire pressure at the end of the day (I do) and find an 80 psi tire was used at 50 psi that day then it's coming off to be replaced with a new one.