The bead is the portion of the tyre which is seating the tyre snugly fit on the wheel. It is composed of high tensile strength steel wire, formed into loops which function as an anchor for the plies and hold the tyre assembly onto the rim of the wheel. Bead failures often occur during the inflation and mounting operation. Bead defects can also arise from the use of worn out or unsuitable rims (parts), the use of damaged, rusted, broken, unsuitable tools and parts, poor fitting, and overheating of brake mechanism.
Cuts/Bruises on tread/sidewall
The tyre cuts, damage and bruises impact the tyre’s life and safety. The main causes for these conditions normally happen driving on rough surface, the relative movements of the tyre tread on the road during accelerating, braking and cornering, which leads to more severe abrasions than on a smooth top surface. Bad roads reduce the contact of the tyre with the road: bumps, pot holes and other obstacles cause the tyre to jump. In this way wear is greatly increased.
Straightness and surface of the road influences tyre mileage performance.
Fast cornering, continued sharp and high speed turning causes rapid tread wear. Quick start and harsh braking would wear off a tyre tread faster due to rapid slippage or scrapping of the tyre tread over the road surface. High speed operations result in increased tyre running temperature, which also causes the rate of tread wear to be faster.
A bent wheel, in addition to probably causing a vibration in the car shall also affect the wear of its tyre. Can even affect the wear on the other tyres. As the bead of the tyre follows the contour of the wheel, a bend in wheel will be mirrored by the tyre’s shoulder tread as the entire sidewall dips to follow the bend. This can cause all kinds of wear and steering discomfort.