Volvo D11F Operator's Manual And Maintenance Instructions page 92

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Incorrect Toe and Axle Alignment
A. Incorrect toe-in
B. Incorrect toe-out
C. Out-of-line axle
D. Steering arm defect
Dual Wheel Mounting
A. Excessive road camber, different types of tire, different circumference
or off-center loading give faster wear on one tire.
B. Air pressure too low, mismatched rims for the tire type and dimension,
excess flexing in tire wall, or different types of tires in inner and outer
tires gives contact wear.
Maintenance and Service