Wheel Alignment: Inspection: Caster

Place the front wheel on the turning radius gauge. Make sure the ground contact surfaces of the front and rear wheels are at the same height.
Set the adapter into the center of wheel, and then set the wheel alignment gauge.

Fig 1: Identifying Alignment Gauge, Turning Radius Gauge And Adapter
Courtesy of SUBARU OF AMERICA, INC.

Measure the caster angle in accordance with the operation manual for wheel alignment gauge.

Tire size	Caster
P225/60R17 P225/55R18	5°40'