GA-600S
3D Wheel Aligner User Manual
1-5
1. 3. 7 Wheelbase diff.
Wheelbase difference is defined as the angle between the joint line of the centre of two
rear wheels and that of the front wheels. It is positive when distance between the
centre of the right wheels is large than that of left wheels; and negative otherwise. If
the tread is available from the vehicle specifications, then the wheelbase difference can
be also expressed by angle. See Figure. 1.7.
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Figure 1. 7
Figure 1. 8
1. 3. 8 Track Width Diff.
Track width (Tread) difference is defined as the angle between the joint line of the
ground-contact point of left wheels and that of the right wheels. It is positive when
distance between the centre of the rear wheels is large than that of front wheels; and
negative otherwise. If the wheelbases are available from the vehicle specifications,
then the tread difference can be also expressed by angle. See Figure 1.8.
1. 3. 9 Left (right) lateral offset (angle)
The offset of rear left (right) wheel and front left (right) wheel at the vehicle’s lateral
direction. When rear left (right) wheel is outside of front left (right) wheel, left (right)
lateral is positive, otherwise, it’s negative. The angle between the trust angle and the
left (right) front/back wheel center line is the left (right) lateral offset angle.
1. 3. 10
Axle Offset (angle)
The relative offset of front axle and rear axle at the vehicle’s lateral direction is defined
as Axle offset. When rear axle is more to the right side than front axle, axle offset is
positive, otherwise, it’s negative. The angle between the center line of the difference
angle and the trust angle is defined as axle offset angle.
