VISUAL GUIDE FOR INSPECTION AND CLASSIFICATION OF TIRES
2-51. RETREAD CONDITIONS (Con't).
c. Buckled Crown (Mounted). Some tires are manufactured with a concave crown while deflated
but assume a flat shape when inflated. The illustration below and on the right shows a buckled crown with
the tire mounted. When inflated, the crown assumes a convex shape as if the tire were overinflated. Note
that the tread is distorted with wide grooves in the center and narrow grooves near the shoulders of the
tire. Tires that are buckled during retread cannot be reworked and should be classified CRC H.
d. Buckled Crown (Unmounted). A buckled crown destroys a tire. The retreader has failed to leave
enough matrix sizes on hand to do a proper job for the tire above and on the left. The tire has been
squeezed into a matrix/mold combination that is too small and the tire has been permanently deformed.
The above illustrations show the most common type of buckling (on the crown). Return the defective tire
to the retreader. Tires that are buckled during retread cannot be reworked and should be classified CRC
e. Buckled Sidewall. Sidewall buckling, as shown in the
example on the right, is far less common. It is an extreme result of
poor workmanship and can easily be recognized. Once buckled, the
tire has been permanently deformed and should never again be
retreaded or used and be classified CRC H.