Consider Use: Vehicle demands, road conditions and driving style are all important considerations. If you are driving a sports car such as a Porsche, Corvette or BMW and enjoy track days from time-to-time, you may need a lighter/stronger wheel.
Construction Methods: The reality is that not all aluminum wheels are created equally. Strength and weight of a wheel are partly determined by how a wheel is made, not only the material it is made of. The three primary methods of O.E. and aftermarket wheel construction are gravity cast, pressure cast and forged.
Gravity Cast: Gravity casting is the most common and least expensive wheel manufacturing process. This is the process of pouring molten aluminum into a mold using only gravity to assist. This results in the heaviest and weakest of the manufacturing methods.
Pressure Cast: Pressure casting is the process of introducing positive pressure to assist in the flow of molten aluminum through the mold. This creates a lighter/stronger product due to higher density than gravity cast at a minimum cost increase.
Forged: Forging is the process of forcing a semi-solid piece of aluminum between the forging dies under extreme pressure. This produces the lightest and strongest product of the three primary methods. Most of the 2- and 3-piece custom wheels and race wheels in the market are forged. The downside is that due to the extensive tooling required to create a finished wheel, forged wheels are considerably more expensive than either pressure or gravity cast.