Air Pressure


Long Tire Wear. Lower Operating Costs.

Today’s commercial tires are better than ever, constructed to deliver longer original tread life, designed with durable casings and built to withstand more retreads. Despite these on-going product improvements, there are still things that you can do to get the most out of your tires.

One way to get the most out of your vehicle is to be certain your tires roll smoothly through an optimized footprint. Unfortunately, the tiniest of imperfections in one of hundreds of mechanisms involved will make your vehicle operate less efficiently. Vigilant inspection, regular service and prudent operation are paramount to ensuring that your cost per mile stays as low as possible. There are three primary factors that prevent optimum performance from being achieved with otherwise mechanically sound vehicles:

  • Incorrect Air Pressure
  • Improper Alignment
  • Operational Inefficiencies

 

Tire Pressure

In general, tires perform best when inflated to match vehicle and axle loads. Steer tires often require maximum inflation pressure to carry the steer axle load, while trailer tires should be set at pressure corresponding to actual tire loading. Included in this guide are the current load/inflation pressure tables for all Yokohama products, only. There are three recommended ways to correctly determine and set operational inflation pressures:


Proper Air Pressure

How a tire wears depends on the forces that act upon the contact patch of that tire as it meets the road. Therefore, it is important to maintain proper inflation pressure. If a tire’s load is equal on all ribs or elements, it tends to have a square footprint shape.

 


Overinflation

An overinflated tire tends to have a short shoulder rib contact area (shorter than the center rib). As the tire rotates, the footprint center maintains close contact, but the shoulder area does not. This causes scrubbing action and uneven wearing of the shoulder rib while placing more strain on the contact area.

 


Underinflation

An overinflated tire tends to have a short shoulder rib contact area (shorter than the center rib). As the tire rotates, the footprint center maintains close contact, but the shoulder area does not. This causes scrubbing action and uneven wearing of the shoulder rib while placing more strain on the contact area.

  • 20% underinflation can reduce tire life 30%
  • 30% underinflation can reduce tire life 40%
  • 40% underinflation can reduce tire life 50%