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Why Do Tyres Fail?

Tyre defects cause too many rollovers, injuries & deaths. When is it going to end?

When a radial tyre suddenly loses it's tread the driver often loses of control of the vehicle due to a blowout of the tyre or rapid pressure decrease in the remaining core. When the blowout occurs to a rear tyre, controlling the vehicle becomes very difficult, especially at highway speeds. This loss of control results in the rear of the vehicle swinging around to become perpendicular to the direction of travel (yawing).

If the yawing is not immediately reversed in direction, then the sideways motion often leads to the bead of the tyre separating from the rim, allowing the rim to dig into the pavement or surface, resulting is propelling the vehicle into a roll. Tripping of the vehicle can also result in a rollover if sufficient amount of sideway movement occurs in a grass or dirt median to actually trip the vehicle and launch it into a rollover.

Tyre manufacturers have known that a leading cause of tread separation is due to the design and placements of the belts and overlying tread. Also Tread and belt separations can occur due to poor adhesion of the components from the use of old and expired adhesives, improper temperatures, rust, unclean manufacturing facility, moisture, oxidation, grease, sawdust, gum wrappers and EVEN cigarette butts.

Of all of the known problems resulting in tyre tread and belt separation, the leading cause of belt separation is the failure of the metal to stick to rubber. The method used most often involves plating the metal with brass and apply a rubber compound containing sulfur. If the sulfur and other compounds are not to the correct mixture, then incomplete adhesion occurs. Also if the brass plating is allowed to oxidize, then adhesion will likely occur. If there is a shiny brass looks to the belts, then most probably there was at least a deficiency in the tread bonding process, if not also compounded by other defects.

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CHOOSING THE RIGHT TYRES