Powerking Towmax ST235/80R16 Tire Failure

gkchevy wrote:
I have had 2 of these tires blow out in a distance of approximately 150 miles of each other.

The first blew and caused $2000 in damage to my 2011 Keystone Cougar 328QBS ... the second happened the day I picked up the trailer from the dealership from being repaired and caused another ~$2000 in damage ... Both tread separation/blowouts occurred with a 0111 DOT Code manufacturing date. both at a travel speed of approximately 60 mph ... both inflated to 80 PSI.

Dynamic Tire in Canada paid for the repairs on the first incident, But are acting like they are refusing to pay for the second incident.

I have found 31 reported cases on the NHTSA website regarding these Powerking Towmax tires
Has anybody else had issues with these tires

ST tires are calculated in their maximum load for lower speed, so more deflection of the tyre is allowed, then an LT tire.
Once calculated it from 2 same sises ST and LT to be about 15% more maximum loadd then a LT tyre of same sises and reference-pressure ( that 80 psi of your tyres).
This means that the deflection is when filled with 80 psi to the limits.
A little overloading on one tire, or little more speed then 65m/h, can bring the deflection over the border where tire damage begins. Can result in sidewal rupture or treath coming loose by the to much bending of the sidewall.

So its best to treath the ST tire as it where a LT tire, so give it the same deflection as an LT would have.
so devide the maximum load by 1.15 to get the maximum load an LT tyre would have. Then in case of tandem axle treath it as an dual load tire so reduce 7.5% of the new calculated maximum load. This together would mean reduce by 20% the maximum load.
Best is then to calculate the needed pressure with that lower maximum load and seperate tyre loads of 4 point weighing in the condition you ride it. Probalbly the outcome will be higher then 80 psi , otherwise your old tires would not get damaged.

If then the needed pressure goes over the Pr of yours 80 psi it is allowed for LT tyres up to 10 psi extra ( so 90psi) says article of goodyear, but tire-rack writes,it is also allowed for ST tires.
Tire-rack to some forum people in the tire business, tough is not such a trusted party, but them writing this will not come out of the blue , is my opinion. Still trying to get comfirmation of a tire-maker trusted by people here ( so no chinese).

My opinion is that you would have gotten the same problemm with same sises and Pr ST tires of a trusted brand, and higher used pressure, wich has to be calculated right , prefents the tire-damage, you builded up in that 1 or 2 years they are under .