1.  SIDE WEAR (Figures 1 and 2)

a.  Outside (All wheels) excessive cornering speed.

b.  Outside (Front) excessive positive camber.

c.  Inside- excessive negative camber

d.  Outside and Inside- under-inflation or vehicle overload.

2.  CENTER RIBS WEAR (Figure 3)

 

a.  Over-inflation

 

 

 

 

 

3.  SHARP RIB EDGES (Figure 4)

 

a.  Inside edges- toe-in excessive.

b. Outside edges- toe-out excessive.

c.  One tire sharp inside, opposite tire sharp outside- bent arm or knuckle.

 

 

 

 

 

4.  ABRASIVE ROUGHNESS ACROSS TREAD

 

a.  Excessive cornering speed.

 

 

 

 

 

5.  HEEL AND TOE WEAR

 

a.  High-speed driving.

b.  Severe use of brakes.

c.  Continuous rapid acceleration.

6.  UNIFORM SPOTTY WEAR (Figure 5)

 

a.  Lack of tire rotation.

b.  Wheel unbalance.

7.  IRREGULAR SPOTTY WEAR

 

a.  Wheel unbalance.

b.  Under-inflation

c.  Loose or worn parts.

Figure 1: Camber Wear

Figure 2:  Under-Inflation

Figure 3:  Over-Inflation

Figure 4: Toe-in Wear

Figure 5: Spotty Wear