2015 RAM 3500 SRW Review

45Ricochet wrote:

Bowhunter61 wrote:

Me Again wrote:

Bowhunter61 wrote:


But even at 70mph, the thing towed great.

Hope you do not have ST tires on the trailer, as they are only rated to 65MPH. Chris

Let me edit this, YES I have ST tires, NO they are not rated for 65mph. They are L rated tires, 75mph.

Maybe share the manufacture of the ST tires rated at 75 MPH. Inquiring minds what to know :B

Here ya go...

From the Tire Rack




Tire Tech




Trailer Tires vs. Passenger Vehicle Tires:


Special Trailer (ST) Tire Speed Ratings

Industry standards dictate tires with the ST designation are speed rated to 65 MPH (104 km/h) under normal inflation and load conditions.

However Goodyear Marathon and Power King Towmax STR tires featuring the ST size designation may be used at speeds between 66 and 75 mph (106 and 121 km/h) by increasing their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.

Do not exceed the wheel's maximum rated pressure. If the maximum pressure for the wheel prohibits the increase of air pressure, then maximum speed must be restricted to 65 mph (104 km/h).

The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.

Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity.