Tire Load and Inflation

by Airstream, Inc.

Maintaining proper tire inflation pressure is essential for both tire safety and performance.

Proper Tire Inflation

The level of air in your tires affects your vehicle’s overall performance. A maximum inflation pressure specification is found on the trailer’s exterior on a metal tag riveted to the lower front, roadside of the trailer, as well as on the original equipment tires. Air pressure should be checked based on the load on each individual tire. Cold Inflation Pressure should be adjusted to handle the maximum tire load, and all tires on the axle should carry the same inflation pressure. Cold tire inflation pressure is the tire pressure checked in the morning before you drive more than a few miles or before rising ambient temperatures or the sun’s radiant heat affects it.

Underinflated Tires

Underinflation brings a higher risk of damage due to road hazards, reduce casing durability, cause a loss in fuel economy, and will result in uneven or irregular tire wear. Severe underinflation brings about an increased risk of tread separation, handling difficulties, and possible tire failure, caused by overheating. When minimum inflation pressure requirements are not met, tire durability and optimum operating conditions are compromised. Tire inflation pressure should always meet the guidelines for vehicle weight.

Observe the following:

• It may be necessary to inflate your tires at a truck stop or truck service center in order to achieve adequate air pressure for your trailer’s needs.

• Only permanent air seal metal valve caps should be used.

• Be safe - if a tire has been run in a 20% underinflated condition, it must be dismounted and inspected by a trained professional. It should not be aired up without a full inspection or without using a safety cage. Use a calibrated gauge. If your tire is rated for higher inflation pressures, a special gauge will be required designed for larger tires.

• Do not bleed air from warm tires to reduce pressure buildup.

• Do not inflate tires to cold PSI rating beyond rim specifications.


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