Opel Frontera UE. Manual - part 672
3E–8
WHEEL AND TIRE SYSTEM
3. Road test again. If improvement is noted, install the
original tire and wheel assemblies one at a time
until the faulty tire is found. If no improvement is
noted, install tires known to be good in place of all
four. Then, install the originals one at a time until the
faulty tire is found.
Radial Tire Lead/Pull
“Lead/Pull" is vehicle deviation from a straight path, on a
level road with no pressure on the steering wheel.
Lead is usually caused by:
1. Poorly manufactured radial tires.
2. Uneven brake adjustment.
3. Wheel alignment.
The way in which a tire is built can produce lead in a car.
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 and the tire will
tend to roll like a cone.
The “Radial Tire Lead/Pull Correction" chart should be
used to make sure that front wheel alignment is not
mistaken for tire lead.
Rear tires will not cause lead/pull.
Radial Tire Lead/Pull Correction Chart
Typical examples of abnormal tire ahead wear and
major causes:
CAUTION: Similar wear patterns can be caused by
worn suspension parts, misalignment of wheels and
tires, and other suspension related problems.
Spotty wear – wear localized on shoulder sections, and
in an extreme cases, the tire becomes polygonal in
shape.
480RW002
Step
Action
Yes
No
1
1. Inflate tires to recommended pressure.
2. Road test vehicle on level uncrowned road.
Was a problem corrected?
End.
Go to Step 2
2
Switch front tires side to side and road test again.
Was a problem corrected?
If roughness
results,replace
tires.
Go to Step 3
3
Did the vehicle lead in same direction?
Go to Step 4
Go to Step 5
4
Put tires back in original position and check alignment.
Was a problem corrected?
End.
Go to Step 5
5
Install known good tire on one front side.
Was a problem corrected?
Replace tire.
Install a known
good tire in
place of other
front tire.
If lead
corrected,
replace tire.