JIMNLIN wrote:
Sorry You need to start working. Look it up yourself. My decision is made. I trust an professional company more that an internet sage.
MM49
Hmmm, just like I thought. Just your opinion.
Once again the Carlisle add does not speak for the P and LT tire manufacturer and is hardly a credible source for basing a opinion that quote;
"Tire companies will not allow P tires or LT type tire to be used in a trailer application."
When the P and LT tire mfg says other wise.
I would trust opinions from veteran members many of whom have hundreds of thousands of miles pulling trailers with these tires over especially Carlisle advertising who's adds are geared to sell the ST tire.
Well, to help everyone out, here's an answer from a less biased source... Tirerack.com:
Note, they do believe that ST tires may have an advantage namely siting the thicker cords for Polyester and Steel. This is in another portion of the page but I just wanted to post what was relevant.
TireRack wrote:
TireRack.com
Your trailer is a follower, which often makes tire sidewall flexing a negative. Sidewall flexing on trailers, especially those with a high center of gravity (enclosed/travel trailers) or that carry heavy loads, is a primary cause of trailer sway. Typical passenger radial tires with flexible sidewalls can accentuate trailer sway problems. The stiffer sidewalls and higher operating pressures common with Special Trailer (ST) designated tires help reduce trailer sway.
Also consider that Special Trailer (ST), as well as Light Truck (LT) tires are fully rated for trailer applications. This means ST- and LT-sized tires can carry the full weight rating branded on the sidewalls when used on a trailer.
However when P-metric or Euro-metric tires are used on a trailer, the load capacity branded on the sidewalls must be reduced by 9%. This means P-metric or Euro-metric tires with a maximum branded load rating of 1,874 lbs. for use on a car is only rated to carry 1,705 lbs. when used on a trailer.
Comparing the load capacities of a pair of tires of the same dimensions fitted to a single axle trailer, ST225/75R15 Load Range C-sized tires inflated to their maximum of 50 psi provide 4,300 lbs. of load capacity, where P225/75R15 Standard Load-sized tires inflated to their maximum of 35 psi would be limited to 3,410 lbs. of load capacity, a total reduction of 890 pounds.
Something I found odd on this web page is the whole going 10psi above max pressure to go up to 75mph. However, many rims in the 14 and 15" sizes are not rated beyond 80psi. I'm guessing that the flex combined with the larger cords causes separation. While the finer/smaller cords probably provide more surface area for the adhesives to bond to. Personally, that sways me towards LT tires with the proper load ratings.