VISUAL GUIDE FOR INSPECTION AND CLASSIFICATION OF TIRES
2-51. RETREAD CONDITIONS (Con't).
o. Insufficient Undertread.
(1) The undertread of the tire on
the right should be about 1/4 inch (6.3 cm)
thick and part of the tread itself. When this
is insufficient, it means that the retreader
did not build up enough rubber or else the
mold was open and the rubber flowed out.
(2) This defect is often present
when the tire buckles in the mold due to
squeezing. When this happens, the tire is
p. No Design on Spacer. This condition will
not cause a tire failure, but will also result in loss of
traction and should be returned to the retreader.