D to E rated tires

Then the brands that specifie the higher maxloads at 80 psi are trying to fit the higher maxload into the stiff American system of E-load always being 80 psi.
Will put remark behind the tires in the quoted part.

Me Again wrote:

Sluggo54 wrote:
"The 225/75 R 15 tire of carlisle and Maxis ( and others like Goodyear) have exactly the same maxload at the same loadrange."

In the US, with few exceptions, the federal government specifies that all tires of a specific size and load rating (E, D, whatever) will have the same maximum load rating (3520, 2840, whatever).

That does not fully apply to ST tires, as some manufactures fumble those numbers.

Here are some examples. The advent of the 7K axle and large RV trailers was in play here!!!! The 80/3420 was the standard until there was pressure for cheap tires to cover a 7K axle. Goodyear is the only one that did not bend to that pressure.

Carlisle
ST235/80R16E inflation 85 lbs 3520 Doing it right because calculate back back with even american formula with power 0.7 gives 3374 lbs wich is lower then normal of 3420

GY Maration
ST235/80R16E inflation 80 lbs 3420 Also OK because 3420 at 80 psi as standard

Towmax
ST235/80R16E inflation 80 lbs 3520Towmax and Westlake both tried to fit the higher maximum load , most likely calculated for 85 psi into the system of 80 psi for E-load so to my opinion wrong atitude, Must be known as C-brand

Westlake
ST235/80R16E inflation 80 lbs 3520

Greenball
ST235/80R16E inflation 80 lbs 3500Greenball used the maximum load AT 80 psi the Loadstar used for 90 psi , Loadstar must be A or B brand and Greenball C-brand.

Loadstar
ST235/80R16E Inflation 90 lbs 3500

Trailer King
ST235/80R16E Inflation 80 lbs 3520Rest all used the Carlisle maxload wich is OK for 85 psi , but use them for 80 psi, wich is to my opinion wrong.
Mayby you can comfirm if all those wrong doing brands are known as C-brand.

Rainier
ST235/80R16E Inflation 80 lbs 3520

Grand Ride
ST235/80R16E Inflation 80 lbs 3520

Arison
ST235/80R16E Inflation 80 lbs 3520

Duro
ST235/80R16E inflation 85 lbs 3520Oversaw Duro with 85 psi using for 3520 wich is OK.