A: In today's marketplace, steel and aluminum are the most common wheel materials. Steel wheels are made in two pieces. The inner piece, which is called the center, bolts on to the car. The outer piece is known as a barrel and receives the tire. The two pieces are welded together to form the wheel. Most original equipment wheels are made this way. Many aftermarket wheels are created this way as well, especially ones made for trucks. Steel is durable and easy to repair. For these reasons, it has remained a popular material for wheel manufacturing. The other material, aluminum, is by far the most popular type of wheel we sell. Its light weight, superior heat dissipation, and seemingly endless design variations make it the material of choice for most buyers. Aluminum wheels can be manufactured in many ways, and each method offers advantages.
The distance from the mounting surface to the back of the wheel.
Bolt Pattern, Bolt Circle Diameter:
The Bolt Pattern is the diameter of an imaginary circle that goes through the center of the bolt holes. Examples are 4x100 mm, 5x4.5 in, 6x5.5 in, 8x170 mm.
The size of the hole in the back of the wheel that centers the wheel properly on the hub of the car. Many aftermarket wheels will be drilled to a larger universal size, and uses hub rings to reduce the size to match the hub on the car for perfect centering. Generally speaking, a perfect hub size match and hub rings can be optional for vehicles that use lug nuts, but are absolutely required for vehicles that use bolts such as BMW, Mercedes, and VW.
The distance from the centerline of the wheel to the face of the mounting surface of the wheel that contacts the hub. A simple way to understand offset, is the lower the offset, the more the wheel will stick out, likewise, the higher the offset, the more the wheel will tuck. For example, and Honda Civic generally uses around a +40mm offset. So if you put a +15mm offset wheel on the car, the wheel is likely to stick out about 1 inch.
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Wheel Pros is a leading owner, designer, marketer, and distributor of branded aftermarket automotive wheels. Founded in 1995 with two distribution centers, the company today carries proprietary, leading brands that are recognized across all major vehicle segments and are sold through 30 distribution centers in the United States, wholly owned distribution in Canada and Australia and select distributors internationally.
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