Tire pressure question

jwoods61us wrote:
"• Goodyear Marathon Special Trailer tires, with the “ST” size designation, are speed rated
at 65 MPH (105 km/h) under normal inflation and load conditions.
• This speed rating is based on Tire and Rim Association loads and inflation pressures for ST
trailer tires without a service description for speeds up through 65 mph. (ref: TRA 2013
Year Book)"

So if I read this correctly,(and I'm sure someone will point out that I did, in fact, not) Goodyear tires are speed rated not on their engineered capacity, but according to the Tire and Rim Association recommendations contained in a document known as the TRA 2013 Year Book. So all the tire experts on here that recite the 65mph speed rating for ST tires as some sort of from on high gospel might be incorrect? Can that be possible?

:? If it is on the internet, it must be true! Right? ;)
;) :S

You are reading it correctly, and yes ST tires only carry a 65 limit by the fact that they are ST. STupid as it is... The problem is that the only ST tire I know of that addresses the difference between engineering design and ST designation is the Marathon. The published critera is all we can use for 99.9% of the ST tires out there.

My 0.02 is that the ST designation should be dropped and all tires receive a speed raiting and a load index number. Tires can be trailer service only and not ST. Just my 0.02.

I currently use LT tires, but for different reasons.