Alloy wheels differ from normal steel wheels because of their lighter weight, which improves the steering and the speed of the car. Alloy wheels are also better heat conductors than steel wheels. It improves heat dissipation from the brakes, which reduces the chance of brake failure in more demanding driving condition. For passenger vehicles, alloy wheels are not only for improved driving performance, it also enhances the look. The bigger advantage of alloy wheels is that balancing them is easy. The balancing weights are attached in the centre unlike steel wheels where they are attached at the edge of the rim. Thus wheel balance is not disturbed by tyre removal, etc. Alloy wheel increase the tyre life with due to high composition of aluminum. Aluminum alloy wheels are increasingly finding usage due to their versatility and high strength to weight characteristics of Aluminum
Alloy wheels give much stability on cornering.They are light in weight and are having high strength.They are having better tolerance, appearance and can withstand the vibrations and shocks.They are having good heat dissipation and open construction, which means the brakes cool better due to increased airflow.
Usually Aluminium or Magnesium.Car Alloy wheels are made from Aluminium Alloy, which is a blend of principally Aluminium and Silicon with various other trace elements added to give the correct mixture for strength without being too brittle.