is used to evaluate the depth of cuts in the thread area.
Tires are marked with a red dot (14) on the sidewall to
indicate the lightweight (balance) point of the tire.
Rebuilt Tires Identification Markings
In the tire rebuilding process, additional markings
are engraved or embossed on the sidewall. See figure
11-14. First, R or TR followed by a number identifies
the number of times the tire has been rebuilt. Next,
the Julian date of the tires rebuilding is added.
Finally, the name of the rebuilder and plant location is
Tube tires with inflation pressures greater than
100 psi and all tubeless tires must be suitably vented
to relieve trapped air. Tube tires are vented in one of
two ways. The first method uses air bleed ridges on
the inside tire surface and grooves on the bead faces.
The ridges and grooves channel the air trapped
between the inner tube and the tire to the outside. The
Figure 11-14.Rebuilt tire identification markings.