VISUAL GUIDE FOR INSPECTION AND CLASSIFICATION OF TIRES
2-48. SIDEWALL AREA CONDITIONS.
a. Ozone Cracking or Weatherchecking on Sidewall. The
cracks in these tires extend down over the sidewalls. Retreading either
tire should not be conducted using conventional methods because the
damaged area will not be removed during the buffing process.
Weatherchecked tires may be retained in service provided the cracks
are not 2/32 inch deeper or deeper or do not join together in a straight
or arced line as shown in the example below. Because of the extent of
weatherchecking, both examples would be classified CRC H.
b. Previous Tire Repair. This tire on the right was
repaired once, then worn to the permissible maximum and
again submitted for repair/retread. The previous repair has not
failed and the tire is still retreadable. Correct classification is
c. Spread or Damaged Cord. This is indicated by a
pencil shape bulge on the sidewall of a radial tire. It is the
result of wider than normal wire spacing and may show up
soon after a repair or from other body ply damage. This type
of bulge should not be confused with normal sidewall waviness
common with some radial tires. If the bulge height does not
exceed 3/8" when inflated the tire can be used on a duel
position but monitored closely. The tire should not be
retreaded or repaired and when turned in with this condition it
should be classified CRC H.