Car Rim Design

1. The size of a car wheel ring
Handled ring diameter and width of the wheel. Figures above 16 x 6.5 above mean diameter of 16 with a width of 6.5 inches. The larger the wheel, usually greater width. The diameter and width will affect tire selection later. The larger the diameter of the wheel, the possibility of used tires will be thinner. Most cars have standard wheels measuring between 14-17 inches.

2. Pitch Circle Diameter (PCD)
Also known as bolt pattern, the pattern and the stud bolt circle diameter. PCD code actually consists of two things, the number of bolts and PCD itself. Adjust the native PCD wheels with wheels that you want instead.
The number of bolts. Each car is equipped with a number of different screws for mounting the wheel. Similarly, the number of screw holes in the wheel manufacturer standards may be different. Most have four or five bolt holes. In the case of modification of bolt holes, more commonly known as holes.
PCD. The layout of the bolt circle hub (center meeting all traffic). So we can imagine this imaginary circle bolt pattern. This is where the PCD diameter is obtained. There have ways to calculate it. Most cars have a PCD 100 or 114.3 mm.

In conclusion, the number of 4 x 100 in the example above means the wheel has four screw holes with a PCD of 100 mm

3. Offset
This one is also important. If the offset is not true, no effect. For example, the wheel can come out fenders or get stuck when turning. Offset is obtained based on the distance from the center of the wheel tread (diameter) with the hub. Offset can be negative, positive, or zero. Usually the car has standard wheels with positive offset. The term "Einpresstiefe 'abbreviated' Et." Is often used interchangeably with the phrase offset. Figures et. 38 above means the wheel has a positive offset of 38 mm.