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Tire Inflation Pressure Control
Tire inflation pressure means pressure
Tire inflation pressure means pressure of air filled in a tire and is important factor like life for a tire moved by force of air. A tire can exert performances of weight Support, braking, endurance power, operation stability and shock absorption, etc only when it is filled with inflation pressure. If not so, tire inflation pressure acts as factor having decisive effect on wearing, stability in traveling, fuel ratio and tire damage, etc. Most important thing in safety control of a tire is inflation pressure and must be checked every month. A tire exerts its function only when a proper air pressure is injected but if not so, tire inflation pressure acts as factor having decisive effect on wearing, stability in traveling, fuel ratio and tire damage, etc. Proper air pressure of the tire for a passenger car is 28 through 32 psi and it is better raise it by 10 through15% or so in high-speed traveling.

01 Irregular wear

For a passenger car, it is generally recommended tire inflation pressure status of 28 ~32psi.
In excess or deficiency of more than 10% at a proper tire inflation pressure, it does not result in so large problems but if it exceeds 10%, irregular wear phenomena occur.
Wear rate is 1.5 times as the rate of tire inflation pressure and when deviation of the tire inflation pressure exceeds 30%, status more rapidly becomes worse

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Where the tire inflation pressure is excessive, a tire grounding pressure is made too much on the central part and thus the only central part is worn. As the result, shock absorption reduces and passenger's comfort reached to the unpleasant level when passing through the convex or concave part.

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Where the tire inflation pressure is deficient, grounding pressure is made too much on the shoulder part and thus both edges are worn and movement of the road surface and the grounding part becomes large and as the result, wear of a tire increases. In addition, for high speed traveling, fatigue level within a tire increases due to repeated excessive extension and contraction movement, resulting in acceleration of rupture

02 Standing wave phenomena

Standing wave phenomena of a tire refers to wave phenomena of a tire appearing in high-speed traveling. A tire is ruptured in a short time if deformity status is repeatedly maintained before the deformed part when a tire revolves at a high speed is restored.
The less tire inflation pressure, the severer such phenomena appear, and the life of a tire is in inverse proportion to the deficiency rate of tire inflation pressure.
Standing wave phenomena reduce strength of adhesives adhering tire cords or commercial cords and thus secession of a tire appears and so results a large traffic accident. To prevent Standing wave phenomena, it is better more increase tire inflation pressure by 10~15% or so than usual time in high-speed traveling.

  • Tire image04

    Tire inflation pressure status of 30psi
    Life of tire: 1hr 47min

  • Tire image05

    Tire inflation pressure status of 20psi
    Life of tire: 1hr 11min

  • Tire image06

    Tire inflation pressure status of 10psi
    Life of tire: 43min

03 Effect inflation pressure on tire

Since adherence between tread and road surface is reduced if tire inflation pressure is not proper, friction power, braking power and handling as well as grounding power is naturally aggravated. There is concern of damage due to standing wave phenomena or wear if elasticity of a tire is lack and passenger's comfort is also naturally reduced.