Tire Pressure Conditions and Consequences
Conditions of Tire Pressure
- Under-Inflation: Research shows that about 56% of all trailer tires are considered under-inflated. Under-inflation of tires results in excess heat and deflection. As a result, under-inflation leads to increased wear, reduced life, and a corresponding drop in fuel economy.
- Over-Inflation: The most common reason for over-inflation is changing in air temperature. Over-inflated tires are harder than usual, making them more susceptible to tread surface cutting, punctures, and impact breaks. It also changes a tire’s footprint, this change in footprint can lead to rapid and irregular wear.
- Mismatched Duals: The purpose of dual tires is to share the load equally. Research indicates that 22% of all dual tires inspected have mismatched air pressure. The difference is often more than five psi. The difference in psi causes the tires to wear more quickly.
Consequences of Improper Tire Pressures
- Decreased Tire Life: Increased tread wear directly correlates to a decrease in tire life.
- Downtime Expense: Nearly half of all road calls are for tire-related issues. Improper inflation causes about one road call each year per tractor-trailer.
- Reduced Fuel Economy: Vehicles running with tires under-inflated by ten psi can see a 1.5% decrease in fuel economy.
- CSA Violations and Fines: Under-inflated tires can result in a citation during a roadside inspection, and even and out of service violation.