Losing 2 PSI per month does not sound like very much, but after 12 months the tire would be considered “flat” and should be removed from service. The composition and gauge of the tire innerliner compound also plays a significant role in osmosis. The type of compounds used in the manufacture of the tire can have a big impact on osmosis. Osmosis of air through the tire casing can lead to a loss of 1 to 3 PSI per month, depending on the specific tire make and model. There really are only four reasons why tires lose air:ġ. Even though the average load may be significantly lower than the worst case load, it still is very important to set the pressure based on that worst case load scenario.įleet tire managers typically ask how frequently they should be checking tire pressures-and why tires lose so much air during the course of the year. Since it is totally impractical to change tire pressures every time the trailer load changes, the recommended tire pressure setting must be based on the worst case load scenario. However, be careful when reading these charts, since the recommended pressures vary depending on tires being run as singles or as duals. These tables are readily available on all the tire companies’ websites. Load-inflation tables state the designed tire pressure defined for given tire loads. If a loaded tire is carrying 6,000 pounds when run on the steer position, then the recommended tire inflation is 110 PSI for the common 295/75R22.5 low profile tire size.
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