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Fitting background information:
PCD (pitch circle diameter) and offset determine the selection of wheels that you can fit to any given car. The PCD refers to the bolt pattern and spacing and is fundamental in fitting a wheel to your car. Most cars will utilise either a 4 or 5 bolt pattern, but not all 4 stud patterns are the same and neither are all 5 stud patterns. If the PCD is wrong it will be impossible to fit the wheel because the bolts holes wont align on the wheel and the hub. If the difference between the wheel and car PCD is within 2mm, it is possible to use wobbly bolts to fit the wheel. A wobbly bolt is a wheel bolt that has a moving taper on the bolt shaft, enabling the bolt to locate to the side of the wheel hole, but the taper locating in the centre. The measurement of the PCD will be 4x100 for a 4 stud wheel with spacing of 100mm and 5x112 for a 5 stud wheel with pitch circle diameter of 112mm.
The offset of the wheel determines the stance of the wheel in relation to the hub and the wheel arch. Most cars will use what is known as a positive offset. This is where the mounting face of the wheel is located further towards the outside of the wheel than the halfway point of the wheels width. A wheel with an offset of et38 would have the mounting face 38mm further out than the centreline, whilst a wheel with an offset of et45 would have the mounting face even further from the centreline at 45mm. The 45mm offset would create a stance where the wheel is tucked further into the wheel arch, the lower the offset the further out of the arch the wheel would poke, creating a wider stance. Having a lower offset can also create a dish on the outside of the wheel, where the face of the wheel is located further in towards the centreline than the outer rim. Having a wheel with an offset too high for your car can cause interference between the tyre and the wheel arch, whilst having an offset that is too low can result in interference between the tyre and the wheel arch.
The centre bore of a wheel will also affect fitments of wheels to your car. This is the size of the hole in the centre of the wheel that locates over the hub. Most after market wheel manufacturers machine a larger centre bore into the wheel than will be needed, meaning that the same wheel can be fitted to various cars with different centre bores using a spigot ring. The spigot ring is a usually plastic ring that fits inside the centre bore of the wheel to create a centre bore that matches that of the vehicle.
It is possible to fit a wheel to a car that has a different PCD by using a hub conversion. You can convert the hub to accept a different wheel fitment by bolting a spacer to the hub that has a different PCD drilled into it. The spacer is bolted to the wheel, and the wheel is then bolted to the spacer.
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