WHEELS AND TIRES
10 - 6
Front beam inspection
◆ The front beam is the distance between the front
wheels at axle height and the rear. The difference
in distance is called the anterior beam value. When
there is A front beam, viewed from the top of the
car, the distance A (rear) is greater than B (front), as
shown in the fi gure.
◆ The function of the front beam is to prevent the front
wheel from running off at any time and reduce the
sliding friction between the tire and the ground. If
the front beam is not correct, the front wheels will
rub against the ground, causing tread damage or
abnormal wear.
The caster and camber angles of the kingpin are
built-in and di bit reqyure adjustment.
A
（
rear
）
– B
（
front
）
=toe value
（The distances A and B are measured at the height
of the axle when the vehicle is parked on a flat
surface.
）
◆ Apply thick chalk or paint line near the center of the
front tire.
◆
When turning a wheel, make a small mark near the
center of the chalk coating with a needle marker.
◆ Place the front wheel on the ground and fix the
handlebars.
◆
At axle height, measure the distance between front
tire front and rear marking or paint line.
◆ The front beam is obtained by subtracting the
measured value at the rear from the measured value
at the front. If the forebeam is not within the specifi ed
range, continue the forebeam adjustment procedure.
Standard：10±10mm（0.39±0.39inch）
Wheel alignment
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