Composite ball-bouncing tyre

A composite ball-bouncing tyre, particularly the tyre that is installed on wheel rims to roll, comprising a subtyre and an inner tube inside, wherein:

• a space is formed between a ring-shaped base of the subtyre and two side walls of the base that extend inwardly, and a plurality of rails and fastening grooves are established at intervals on inner walls of the space;
• at top of both sides of these rails, there is a slope part that converges along the rolling direction of the subtyre, and at the bottom of the fastening grooves, there is a plurality of fixing grooves that are vertical to the rolling direction;
• and one or more resilient balls that reciprocate are installed inside each rail;
• the inner tube is installed within the space, and includes a base component that rotates together with a wheel rim inside it and enables the resilient balls to bounce within the rail as the slope part presses;
• on outer walls of the base component, there is a plurality of fixing parts that can be inserted into the fastening grooves of the subtyre for fixing purpose, and a plurality of fastening parts projects from the surface of each fixing part and is used to be placed into a plurality of fixing grooves inside the fastening grooves.