Originally Posted by Wallo
Isn't the recommended tire pressure printed on the side of the tire? That's what I've always used. I also account for the outdoor temp summer and winter.
Not really. They print the MAX inflation on the tire... just as they give a MAX speed rating. That doesn't mean I have to drive my car at 120 MPH all the time because it says MAX 120 MPH on the side of the tire
You'll notice that your car's manufacturer gives you the tire pressure recommendations, not the tire manufacturer. That's because the tire isn't made for just your model of car, but is likely used for many different makes and models, with a wide weight range. A trailer manufacturer should also give you a pressure recommendation based on the weight on the tires
. The manufacturer just gives you the "not to exceed" pressure. Cargo trailers differ, because the weight will be very different between an empty and a full trailer... so tire manufacturers provide info based on the actual weight that you are running at the time. I keep a 12v compressor in my car so that I can lower the pressure in my cargo trailer when towing it empty (or light
loads) and raise the pressure when I have heavy loads in it.
It IS true that underinflation can result in the tire running too hot, which can cause catastrophic tire damage. I am NOT recommending that anyone run their tires
at too low a level. I am talking about running the tire at the recommended pressure. Just keep in mind that the weight charts are talking about the weight on EACH tire, not the weight of the trailer. Yes, you CAN run the tire at the max pressure, but the ride might be bouncier. I noticed that with my Scamp
, even at just 35 PSI. I felt that the bouncing was not good for the trailer, its contents, or my car's hitch. I check my tire temperature (tow vehicle and trailer) after long hauls... and they are all within a normal temperature range. I also found that I needed to up the pressure in my car's rear tires to account for the extra weight. That brought the temperature back down.