Radial Tire Lead / Pull Description; Balancing Wheels Description - Suzuki SX4 Service Manual

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Road test vehicle on level unrouned road in both directions
Leads in same direction
Put tires back in original position
and check alignment

Radial Tire Lead / Pull Description

"Lead / Pull" is the deviation of the vehicle from a straight
path on a level road even with no pressure on the
steering wheel.
Lead is usually caused by the following conditions.
• Improper tire and wheel alignment.
• Uneven brake assemblies.
• Tire construction.
The way in which a tire is built can produce lead in a
vehicle. An example of this is placement of the belt. Off
center belts on radial tires can cause the tire to develop
a side force while rolling straight down the road. If one
side of the tire has a little larger diameter than the other,
the tire will tend to roll to one side. This will develop a
side force which can produce vehicle lead.
The procedure in the figure (Lead Diagnosis) should be
used to make sure that wheel alignment is not mistaken
for tire lead.
• Part of the lead diagnosis procedure is different from
the proper tire rotation pattern currently in the owner
and service manuals. If a medium to high mileage tire
is moved to the other side of the vehicle, be sure to
check that ride roughness has not developed
• Rear tires will not cause lead.

Balancing Wheels Description

There are two types of wheel and tire balance: static and
dynamic. Static balance, as shown in figure, is the equal
distribution of weight around the wheel. Wheels that are
statically unbalanced cause a bouncing action called
tramp. This condition will eventually cause uneven tire
Equipment manufacture's recommendations
Inflate tires to recommended pressure
Switch front tires side to side and road test again
Lead corrected,
if roughness results, replace tires
Lead corrected replace tire
Lead corrected replace tire
Leads reverses direction
Install a known-good tire on one front side
Lead remains install a known-good
tire in place of other front tire
Lead remains known-good tires are not good
1. Heavy spot wheel tramp
2. Balance weights addition point
3. C/L of spindle
Dynamic balance, as shown in figure, is the equal
distribution of weight on each side of the wheel
centerline so that when the tire spins there is no
tendency for the assembly to move from side to side.
Wheels that are dynamically unbalanced may cause
1. Heavy spot wheel shimmy
2. Balance weights addition point
3. C/L of spindle
Wheels and Tires:
[A]: Before correction
[B]: Corrective weights
[C]: Before correction
[D]: Corrective weights


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