Thrust Angle

Fig 1: Identifying Thrust Angle

Courtesy of FORD MOTOR CO.

Rear thrust angle can be defined as a line bisecting rear toe or simply, the direction in which the rear wheels are pointed.
Rear thrust angle = (LR toe minus RR toe)/2
If the rear wheels are pointed to the right, thrust angle is positive; if the rear wheels are pointed to the left, thrust angle is negative.