Launch KWA-300, User Manual

LAUNCH                       KWA-300 3D Wheel Aligner                              Introduction 

1-3 

Fig.1.6 

Wheelbase Difference 

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 track width is 
available from the vehicle specifications, then the 

wheelbase difference can be also expressed by angle. 
See Fig. 1.7 

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Fig. 1.7 

Track width Difference 

Track width 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 track width difference can be also expressed by 
angle. See Fig. 1.8. 

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Fig. 1.8 

Left (right) lateral offset angle 

The relative offset in lateral direction between front axle 
and rear axle of vehicle is axle offset. When rear wheel 
axle is offset to right from the front wheel, the axle offset 
is positive, otherwise is negative. The angle between the 
bisector of the track width difference angle and the 
thrust line is axle offset angle. 

Axle offset angle 

The relative offset in lateral direction between front and 

rear axle of vehicle is axle offset. When LR (RR) wheel 
is offset outside from LF (RF) wheel, the left (right) 
lateral offset is positive, otherwise is negative. The angle 
between the connecting line from the front wheel center 
point to the rear wheel center point (same side) and the 

thrust line is left (right) lateral offset. 

Delay angle 

The angle between the connecting line from the LF (LR) 
wheel center point to the RF (RR) wheel center point 
and the perpendicular of the longitudinal geometry 
center line is called front (rear) delay angle. When the 
right wheel on the front (rear) axle is behind the left 

wheel, the front (rear) delay (angle) is positive, 
otherwise is negative. 

Included angle 

The sum of the SAI (Steering axle inclination) and the 
wheel camber is called included angle. 

Functions and Features 

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Complete test: The KWA-300 3D Wheel Aligner 
can be used to measure the most wheel alignment 
parameters, such as front  wheel toe-in, front 
wheel camber, caster, steering axle inclination, 

maximal steering angle, thrust angle, toe-out on 
turns, rear wheel toe-in, rear wheel camber,  
wheelbase difference, track width difference, etc. 

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Brand new 3D computer vision measurement: