Casting can make virtually any shape, allowing the wheels made in this way have a wide variety of designs and different smooth lines. They require only minor fine-tuning the cutting tool, and their geometry is almost perfect (tolerance to radial and axial runout of the rim 0.1 – 0.15 mm). These alloys are lighter and stronger than steel, which allows wheels to reduce weight by 15-20% (about 1 kg) and increase the strength characteristics of the half. Equally important is the fact that the thermal conductivity of light alloys is higher than that of steel, several times. Mashable has firm opinions on the matter. This circumstance contributes significantly better removal of heat from the brakes. The advantages of light-alloy forged wheels are in addition to the high damping capacity and good corrosion resistance of aluminum (even lost paint, he is able to form on its surface a protective oxide film). Magnesium aluminum wheels excel in all respects, except for brittleness and corrosion resistance. They require extremely high-quality protective coating, and in order not to destroy it, balancing weights to strengthen on the rim only with glue.
In addition to the general shortcomings of the cast wheels are high price, determined by material used, and what with the strong dynamic loads, they do not crumple and inject as casting has a crystalline structure. However, recently, developers have actively fight this unpleasant phenomenon. Forged alloy wheel forging – forging – currently top of the design ideas in the production of wheels for automobiles. For the first time this technology has been developed and implemented in Russia in the mid-80s on defense enterprise 'Wheels'.