Table 8

Analysis of Effect of Rear Tire Tread Separation on Understeer Gradient
Trends in Understeer Gradient (UG)
- with and without a Rear Tire Tread Separation
Model Year* Understeer Gradient
Tread On
Understeer Gradient
Tread Off O/S Rear
Understeer Gradient Delta
Max. UG Tread On 2000 6.17 1.82 4.35
Min. UG Tread On 2002 1.06 -3.89 4.95
Mean UG Tread On   2.97    
Median UG Tread On   2.57    
         
Max. UG Tread Off 2001 5.04 2.20 2.84
Min. UG Tread Off 2001 1.86 -5.31 -7.17
Mean UG Tread Off     -1.34  
Median UG Tread Off     -1.31  
         
Max. Delta UG 2001 1.86 -5.31 7.17
Min. Delta UG 2001 1.93 -0.14 2.07
Mean Delta UG       4.30
Median Delta UG       4.18
*All vehicles are 4-dr. SUVs with wheelbases between 104 and 116 inches and curb weights between 3,500 and 4,700 lbs.