Abstract: Wheel alignment adjustment system includes sensing apparatus for sensing alignment characteristics of a vehicle to be aligned, a memory for storing alignment specifications for a plurality of vehicles, at least one manually operable input device, operable by a user, for selecting parameters of an installed alignment component, a logic circuit for determining, from sensed alignment characteristics, corresponding alignment specifications, and the installed alignment component parameters, an adjustment to improve the alignment characteristics, and a display for displaying to a user a representation of the determined adjustment. A method using the system is also disclosed.

Abstract: Toe of a pair of wheels on the same axle is adjusted by first measuring the toe of a first wheel of the axle. A specification value for the toe of the first wheel is then subtracted from the measured value of toe for that wheel, and the difference is stored as a first toe comparison value. The toe of a second wheel on that axle is adjusted until the total toe of the wheels on that axle minus a specification value for total toe for the wheels on that axle equals the first toe comparison value. The toe of the first wheel is subsequently adjusted until the total toe of the wheels on the axle is substantially equal to the specification value for the total toe for the wheels on that axle. Apparatus which performs the method is also disclosed.