TYRE TYPES

Tyre cross-section

Tyre cross-section

Tire Cutaway

Types of Tyres

Types of tyresConventional tubed tyre.

Tubeless tyre.

Tubed tyre

Tubeless tyre

Advantages of tubeless tyres

Lesser unsprung weight.Better cooling.Lesser rolling resistance.Comfortable ride.Slower leakage of air.Simpler assembly.Improved safety.

Tyre Construction OR

Types of carcass(Tread)

Types of carcass(Tread)OR

Tyre Construction

Cross ply (or) bias ply type.

Radial ply type.Belted bias ply type.

Cross ply (or) bias ply type.

Cross ply (or) bias ply type.

Cross – ply

• the construction details are useful to show how tyre technology has developed.

• Several textile plies are laid across each other, running from bead to bead in alternate directions.

• The number of plies depends on the size of the tyre and the load it has to carry.

• The same number of plies is used on the crown and the sidewalls.

Radial ply type

Radial ply type.

Radial – Ply• Radial – Ply tyres consist of a carcass ply

formed by textile arcs running from one bead to the other.

• Each ply which is laid in an arc at an angle of 90 degrees to the direction the tyre rolls.

• At the top of the tyre crown (under the tread), there is a belt made up of several plies reinforced with metal wire, laid on top of the carcass ply.

• These crown plies, laid one on top of the other, overlap at an angle determined by the type of the tyre.

• Remember the tyre tread depth must be not less than 1.6mm over the central three-quarters of the tyre and must go all the way round the circumference in an continuous unbroken band with no bald patches anywhere on the tyre tread.

• If radial and cross-ply tyres are fitted to the same vehicle, the radial-ply tyres must only be fitted to the rear.

• Cross-ply and radial ply tyres must never be fitted to the same axle.

• Tyre pressures must be set to the manufactures recommendations.

• The tread and side wall must be free from large cuts, abrasions or bubbles

Belted bias ply type

Comparison of radial and Cross-ply Tyres

Advantages of radial ply Tyres:- The side walls can be bend readily ,its shock absorbing

capacity is 25% more than bias ply or cross ply.

The breaker strips of radial Tyres act independently of the wall plies unlike in cross ply where there is no breaker strip.

Lower rolling resistance and hysteresis loss leads to less fuel consumption.

Longer tread life because of less heat build in Tyre.

Breaking efficiency on wet roads is better because of greater sidewall flexibility and tread stiffness.

Smaller slip angles and higher cornering power which results in Better steering characteristics.

While taking turns it has less tendency to distort and lift off the road from one side.

Larger resistance to punctures ,cuts and impacts in the tread area.