75mph ST tire
I offer this only as info for the always entertaining and ongoing argument....ooops, I mean "discussion" regarding tires. I was out this morning shopping for a new horse trailer, so of course I looke...
Forum Discussion
CapriRacer wrote:
More fuel for the fire:
For those who point to the regulations and the testing required, how do you reconcile the fact that LT tires are testing at lower loading levels than ST tires for the same size? Doesn't this mean that ST tires are tested to more stringent conditions than LT tires?
No......each tire type/size/load range carries its own load rating.
Nor does it mean a ST 235/85-16 E load range at 3640 lb capacity tire test per the FMVSS test procedures is less stringent than a ST235/85-16 load F at 3960 lbs capacity.
Quote per SeniorGNC;
The difference in endurance testing between a ST and LT tire is significant. Both tires are tested through a equivalent loading/time profile. However, the LT tire is tested at this profile at a higher speed (75 vs. 50 mph) and must still endure an additional 2 hour low pressure test without failure. Thus the overall test for the LT is far more rigorous than the ST test.
