In order:
A car rolls by using it's wheels.
Cars are made from many materials. Bodies can be made of metal, plastics, aluminum or even carbon fibers. Wheels and internal parts have many materials as well.
RC car wheels are typically made from a combination of materials, primarily plastic and rubber. The wheel rims are often made from durable plastic to reduce weight, while the tires are usually made from a softer rubber compound for better traction and grip on various surfaces. Some high-performance models may utilize foam or specialized materials to enhance performance and durability. Overall, the choice of materials can vary based on the intended use and design of the RC car.
rubber
To make a car that has wheels made out of compact discs, everything else must be in porportion.
Most commonly steel or aluminium, some have been made of carbon fibre and others of Plexiglas
the wheel is made of rubber
Standard car and truck wheels are made of steel, "alloy" wheels are made of a lightweight aluminum alloy.
Casting Casting
Carbon...
In China
Aluminum