TIRE MAINTENANCE MANUAL - Goodyear Off-The-Road (OTR)
TIRE MAINTENANCE MANUAL - Goodyear Off-The-Road (OTR)
TIRE MAINTENANCE MANUAL - Goodyear Off-The-Road (OTR)
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forms a barrier to protect the carcass from<br />
the weather.<br />
Deflection<br />
Many people think that deflection describes<br />
the bulge at the bottom of a loaded<br />
tire. Actually, this bulge occurs as a result of<br />
deflection.<br />
Deflection really describes the change in<br />
the tire’s radius when a normal load is applied.<br />
<strong>The</strong> radius is measured from the center<br />
of the axle/hub to the ground (See<br />
Figure 2, above).<br />
Unloaded Radius is measured with no<br />
weight on the tire. <strong>The</strong> tire is mounted on<br />
a rim and inflated to working pressure. <strong>The</strong><br />
tire is stood and supported so the tread<br />
touches the ground. However, no load is<br />
applied (ie. not even the weight of the tire<br />
and rim).<br />
Basic Factors Tire Maintenance<br />
UNDEFLECTED<br />
(Zero Load)<br />
NORMAL<br />
DEFLECTION<br />
(Rated Load/Inflation)<br />
5<br />
Inner Liner<br />
A specially formulated rubber compound inside<br />
the tire that minimizes permeation. It<br />
works with the rim and O-ring to contain<br />
the inflation medium in tubeless designs.<br />
OVERDEFLECTION<br />
(Overload and/or<br />
Underinflation)<br />
Static Loaded Radius is measured with the<br />
weight of the vehicle and payload on the<br />
tire. Static means that the tire is standing<br />
still.<br />
<strong>The</strong> deflection is the difference between<br />
the Unloaded Radius and Static Loaded<br />
Radius. This is the same distance that the<br />
axle lowers when the vehicle is fully<br />
loaded.<br />
Deflection is extremely important. Engineers<br />
design tires to operate at a certain percentage<br />
of deflection. Operating with too<br />
much deflection reduces tire life.<br />
Load and Pressure Relationship<br />
Each tire is designed to carry a specific load<br />
at a specific inflation pressure. (Load/Inflation<br />
Tables are in the back of this book).<br />
When the tire is inflated to the correct