EP 1110-1-8
(Vol. 12)
31 July 03
APPENDIX G
TIRE LIFE AND TIRE WEAR FACTORS
SECTION I. TIRE WEAR FACTORS
The tire wear factors used in this pamphlet are listed in appendix D. The "useful
life" of a new tire is the product of Condition Factors (CF) from group A through group E
multiplied by the Wheel Position Factor (WPF), and for drive tires only, the Grade Factor
(GF). These factors provide a percentage reduction to the maximum tire life. See
chapter 2 for tire methodology.
Drive Tires: Useful Tire Life = (CF x WPF x GF)
All Other Tires: Useful Tire Life = (CF x WPF)
EXAMPLE
(Condition Factors, Wheel Position Factors, and Grade Factor
are from GMC Terex Guide.)
Factors are specifically for a rear dump wagon.
Condition Factors (CF):
Average
Severe
A
Maintenance
1.00
1.00
B
Speeds
0.80
0.85
C
Curves
1.00
0.90
D
Surface Condition
0.90
0.70
E
Loads
0.90
0.80
CF
Product of the factors
0.65
0.43
(A x B x C x D x E)
Wheel Position Factors (WPF):
WPF-FT
Front Tire (FT)
0.90
0.90
WPF-DTR
Drive Tire (DT) - Rear Dump
0.70
0.70
WPF-TT
Trailing Tire (TT)
1.00
1.00
Grade Factor (GF):
GF
Grade Factor (Drive Tires Only)
0.085
0.75
G-1
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