The wheel is one of the most important discoveries a man, a dead race with a beer and an internal combustion engine. It is thought for a wheel to have been invented in the 5th millennium BC. Although it was used a long time before that, it was not until the end of the 19th century that its full potential was noticed.
Basic dimensions of the wheel
To begin with, we will focus on the technical specifications of the wheels. Each rim has dimensions and labels to help determine which car model can be mounted.
The basic dimensions of the wheel are its diameter and width, e.g. 15″x7″, 14″x6″, 17″x8″ and so on.
The first digit indicates the diameter of the rim and is expressed in inches (1 inch = 2.54cm). The second digit signifies the width, also in inches, and it’s usually marked with a letter J (15x7J) next to it. This letter denotes the shape of the wheel fender on which the tire is fitted.
Wheel PCD
The Pitch Circle Diameter (PCD) is the diameter of the circle which passes through the centre of all the studs, wheel bolts or wheel rimholes. The easiest way calculate the PCD is as follows: 1) Measure the distance ‘S’ between two adjacent studs from the centre of each hole.
Konig Wheels
The Pitch Circle Diameter (PCD) is very important when choosing the right size tire for a particular setup. PCD is consisted of 2 digits also; first digit is a number of holes rim should have and the second digit stands for the distance – the diameter of the imaginary circle that passes through the centers of all holes. E.g. 4×100, 5×100, 5×112 etc.
The central wheel bore size is the diameter of the central hole of the rim that sits on the hub. Dimensions vary and as long as the central bore on your wheel is larger than the hub on your car, you can use adapters/rings to fill the gap.
Wheel offset (ET)
Offset or ET of the wheel indicates how far the center of the wheel is from the place where the wheel is attached to the hub. It can be positive or negative ET. Most wheels have a positive offset. Simply put, this digit indicates how the wheels will sit, will it poke or will you be able tuck it under a fender.

The larger the number is, wheel be more tucked in (might be too much and hit the inside of the car). Smaller the number, your wheels will poke more.
Split wheels
The wheels can be monoblock or multi piece. Why?
The main advantage of the multi-piece wheel is the possibility of its disassembling and changing components. This can be done either to change the width of the rim, or in case of damage – you can replace only a specific component (lip, barrel or the center).

There is of course a element of prestige, you having a wheel that is unusual, rare, unique… to some of us, that is priceless.

How to choose the right wheel design for your car?
When choosing a design, it is best to stick to the same generation as your car. You have a 30 year old car? Choose a wheel from the same era. If you are not completely sure, the inscription “Made in Western Germany” is a valid indicator.
By all means, we are not saying you can’t mix it up. Sometimes it can look as good. What more, these days it is really popular, and we see a lot of now age cars on oldschool wheels, and vice versa.

If you want to stand out from the mass, you will need a “Jordanian” in the world of a sneakers, “Pilsen” in the world of beer. You need a rare exotic wheel, e.g. with some limited series, “M”, “RS”, “GT”, “AMG”.
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Rim with a pedigree, a rim that will break the necks, more than Miss Lopez’s buttocks. Such rims are understandably harder to find and not for everyones budget, but if you are one of those that thinks a rim is a half a car, you will not regret it for a second. After all, this sport is expensive.
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