Lesson 3/Learning Event 2
If the tire was carefully inspected prior to removal from the wheel, only those areas that
could not be seen while mounted need to be inspected. If no inspection has been made,
make all of the checks listed for a mounted tire. In addition, check the inside surfaces
and beads. Check the bead for damage. Bead damage often occurs during installation
and removal of the tire from the wheel. It is particularly important to check the outside of
the bead on the tubeless tires since this area acts as a seal to retain the air. Check the
inner surface of the tire for cuts, punctures, and bulges. If the cord plies have been pulled
loose from the normally smooth inner surface, it indicates the tire has been operated
INSPECTION OF WHEELS
Inspect the wheel for cracks, dents, and oversized mounting holes. When a vehicle is
operated with the wheel mounting nuts loose, the wheel will move against the studs and
enlarge the mounting holes. In time, the holes will become so enlarged that it will be
impossible to tighten the wheel properly.
Cracks may develop in any part of the wheel, but the area around the mounting holes will
usually be the first place they appear.
Large dents are usually the result of an accident, such as a wheel striking a log, a curb, or
A warped wheel is difficult to detect when off the vehicle. It is easier to detect a warped
wheel while the vehicle is moving because of noticeable weaving in and out. If the
vehicle is in the shop, the mechanic can raise the wheel off the floor and rotate the
assembly. By looking at the tire from the front as it spins, or comparing it with a
stationary object, a warped wheel can be detected. If the damage is enough to make the
wheel unserviceable or unsafe, it should be replaced.