Tire Pressure Temperature Calculator

Tire pressures are set at ambient temperature and a 10 degree drop in ambient temperature drops your tire pressure roughly 1 psi.

Tire pressure temperature calculator. Using the vehicle s weight capacity for each axle and other considerations the manufacturer can best calculate the psi needed to ensure the tire handles and performs well. Cold weather is here check your tire pressure cooler weather in much of the northern hemisphere now is a good time to check your tire pressure. Off road hi performance truck suv trailer commercial van winter community. In our example this results in 75 or 2 205 minus 2 130.

In figure 2 i look at two different air temperatures. Particular tires and rims. You can see from the charts or equations that for my tires and rims that s accurate to about 10 so for example if you measure your tire pressure at 90 degrees fahrenheit the standard pressure at 68 degrees. So if outside air temperature decreases 30 from your last tire pressure adjustment expect tire pressure to drop about 3 psi.

Pressure for the tires. About news events gallery videos motorsports sponsorship contact tires. To determine how much tire pressure to add subtract the weight of the new tire at pressure from the weight of the old tire at pressure. A good estimate is for every 10 fluctuation in air temperature vehicle tire pressure will adjust by about 1 psi.

Cold means that the tire is the same temperature as the outside air and has. The pressure indicated on the sidewall is not the maximum pressure for the tire but is the minimum pressure required to achieve the maximum load rating of the tire. We see in the example that the change in tire pressure with temperature is about 1 psi for every 10 f change in temperature for a 40 psi tire pressure at 68 f. Even if you put 50 psi in an sl tire the load capacity will remain what it is at 36 psi for the higher pressure levels.

Whatever pressure you choose it must be set when tires are cold. Next take that result and divide it by the pounds per psi of the new tire. All too often many drivers and mechanics assume the maximum tire pressure listed on the tire s. This equates to 1 23 or 75 divided 60 8.

So a tire that was set perfectly at 75 degrees would automatically. Check pressure when tires are cold. You will notice that for a given tire pressure the pressure change with temperature increases with lower reference temperature. Adding tire pressure above maximum load capacity is used mostly for high speed situations.

Well a good rule of thumb is that pressure varies 1 psi for a temperature change of 10 degrees fahrenheit.