ABNORMAL TREAD WEAR
Tread wear issues appear as flat spots, areas of rapid wear, deformed tread blocks or cracking. Usually a result of brake, suspension or alignment problems, unbalanced tire and wheel assembly, or misuse.
Sidewall damage appears as cuts, tears, bubbles or scrapes along the sidewall. This type of damage usually occurs following encounters with road hazards such as curbs, pieces of metal or sharp objects. Bubbles and scrapes occur due to impact damage or prolonged abrasion.
Separations appear as bulges on the shoulder or tread, or as localised wear above the separated region. A groove worn along the shoulder could be a sign of separation. Separations are mainly caused by abnormal heat build up which can be caused by prolonged high-speed driving, overloading or under-inflation. Separations can also be caused by penetration of water or foreign materials into the tyre carcass, usually through cuts caused by road hazards.
Road hazard damage appears as protruding objects or cuts in the tyre. Misuse or neglect appears as wrinkles in the inner liner or scuffing around the circumference of the tyre, usually caused by severe under- inflation or insufficient clearance between the tyre and wheel-arch.
A broken or damaged bead can occur when a tyre is mounted on an improper rim or carelessly mounted or dismounted. Bead chafing can occur when mounting a tyre on a dirty or mismatched rim, or from overloading or under-inflation. A deformed bead usually occurs through improper storage or excessive stress applied during mounting.