![]() The second reading is taken when all tires are on the scale, and the third is for the back tires. The first one is for when only the front tires are on the scale. You’ll have to take three weight readings at the truck stop.You can use the compact scales in a race shop near you to get these weights easily. You have to weigh and calculate your front tires and then, separately, your rear tires.By loading materials into the vehicle, filling the gas tanks, and getting more passengers, you’ll get a more reliable result. Getting the front and rear weight of your truck is the next move.You can easily get your tire chart online from the tire shop. The tire manufacturer determines the optimal tire pressure for different loads.Using one of the two techniques detailed below, you can determine tire pressure temperature. How to Calculate Tire Pressure Temperature You can find that the pressure change with temperature rises with a lower reference temperature with specified tire pressure. There are two different air temperatures in Figure 2. We see in the illustration that the temperature difference in the tire pressure is around one psi for each temperature change of 10 ° F for a tire pressure of 40 psi at 68 ° F. ![]() So realize that this temperature is being transformed into Kelvin when you see a term like “(-20)☏”. Mathcad transforms temperatures to an absolute scale automatically (e.g., Kelvin). Nominal 40 psi tire pressure (gauge pressure) The ambient temperature of the tire is 20 ☌ (68 ☏). We can add Equation 2 to a common tire pressure scenario to give us the rule of thumb in Figure 2.
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