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2D-3 Wheels and Tires:
Irregular and/or Premature Wear Description
Irregular and premature wear has many causes. Some
of them are: incorrect inflation pressures, lack of tire
rotation, driving habits, improper alignment.
If the following conditions are noted, rotation is
necessary:
• Front tire wear is different from rear.
• Uneven wear exists across the tread of any tire.
• Front tire wear is unequal between the right and left.
• Rear tire wear is unequal between the right and left.
• There is cupping, flat spotting, etc.
A wheel alignment check is necessary if following
conditions are noted:
• Front tire wear is unequal between the right and left.
• Wear is uneven across the tread of any front tire.
• Front tire treads have scuffed appearance with
"feather" edges on one side of tread ribs or blocks.
[A]: Hard Cornering, under inflation or lack of tire rotation
[B]: Incorrect wheel alignment, tire construction not uniform or wheel
heavy acceleration
Wear Indicators Description
Original equipment tires have built-in tread wear
indicators (1) to show when they need replacement.
These indicators (1) will appear as 12 mm (0.47 in) wide
bands when the tire tread depth becomes 1.6 mm (0.063
in).
When the indicators (1) appear in 3 or more grooves at 6
locations, tire replacement is recommended.
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Radial Tire Waddle Description
Waddle is side to side movement at the front and/or rear
of the vehicle. It is caused by the steel belt not being
straight within the tire. It is most noticeable at a low
speed, 8 to 48 kph (5 to 30 mph).
It is possible to locate the faulty tire by road testing the
vehicle. If it is on the rear, the rear end of the vehicle
shakes from side to side or "waddles". To the driver in
the seat, it feels as though someone is pushing on the
side of vehicle.
If the faulty tire is on the front, waddling is more visual.
The front sheet metal appears to be moving back and
forth and the driver feels as though he is at the pivot
point in vehicle.
Waddle can be quickly diagnosed by using Tire Problem
Detector (TPD) and following the equipment
manufacture's recommendations.
If TPD is not available, an alternative method of
substituting known-good tire / wheel assemblies can be
used as follows, although it takes a longer time.
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1) Ride vehicle to determine whether the front or rear
waddles.
2) Install tires and wheels that are known to be good
(on similar vehicle) in place of those on waddling end
of vehicle. If waddling end cannot be identified,
substitute rear ones.
3) Road test again. If improvement is noted, reinstall
originals one at a time till waddle causal tire is found.
If no improvement is noted, install known-good tires
in place of all four. Then reinstall originals in the
same manner.
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