This type of tyre does not need separate tube, instead the air under pressure is filled in the tyre for which purpose a non return valve is fitted to the rim. The tyre is directly mounted on the rim and retains the air. The inner construction of tyre is almost the same as that of tubed tyre, except that it is lined on inside with a special air-retaining liner. It consist of two main parts i.e. carcass and tread. The carcass is basic structure taking mainly the various loads and consists of a number of piles wounded in a particular fashion from the cards of rayon or any other suitable material. The tread is a part of tyre, which comes in contact with the road surface when the wheel rotates. It is generally made of synthetic rubber. The design of tyre treads depends on various tyre properties like grip, noise and the wear. Between the bead and the tread, outer rubber covering and the carcass is called the sidewall. At the inner edges, beads are formed by reinforcing with steel wires. All piles are tied to the beads, which prevent any change of shape.

Advantages:-

1) Lesser unsprung weight-due to lack of tube weight reduce & increase fuel efficiency .

2) Better cooling:-hence there is no tube heat directly transferred to rim which provide better cooling.

3) Comfortable ride:-in tubeless tyre shocks & vibration absorbed effectively which increase driving comfort.

4) Slower Leakage of air:- in case of puncture air retaining liner hold nail in position & prevent sudden air diffusion.

5) Simple assembly:-Only the tyre has be fitted on rim

6) Improve road safety:- in case of puncture air defuses slowly which provide safety to driver as well as other.