In layman terms, Alloy wheels are wheels made from aluminium or magnesium alloy. Sometimes, a small percentage of nickel is added to either of these metals as it affects wheel’s brittleness. An alloy is a metal formed by the combination of two or more metallic elements.
Alloy wheels are lightweight, good conductors of heat and corrosion resistant. Being available in various polishes and finishes, they also improve your vehicle’s appearance and set it apart from the herd.
Understanding Alloy Wheels
Understanding PCD (Pitch Circle Diameter)
The PCD, also referred to as BCD (Bolt Circle Diameter), is the diameter of the circle that passes through the centre of each bolt holes of the wheel. PCD is measured in millimetres (mm). A 4×100 wheel means that the wheel has four bolts and the diameter of the circle passing through the centre of each bolt hole is 100mm.
Understanding Wheel Offset (ET)
The wheel offset (ET) is the distance between the hub mounting surface and the centre line of the wheel. It is measured in millimetres and based on wheel’s positioning, can result in zero, positive or negative offset.
Zero Offset is when the centre line is in-line with the hub mounting surface.
Positive Offset results when the hub mounting surface is set towards the front side(outer side) of the wheel. Most newer vehicles now come with Positive Offset.
A negative Offset is when the hub mounting surface is behind the wheel’s centre line.
It is vital you get the offset values correct for your vehicle, as setting them up at incorrect values can affect your steering and suspension system.
Modifying the Offset Using Wheel Spacers
Wheel Spacers can be used when your vehicle’s wheel offset is too high. Spacers push the wheel out till they are in sync with your vehicle’s bodywork and arches. Using Wheel spacers allow you to use wheels that are not in direct fitment of your vehicle, thereby expanding the range of wheels you can choose from for your car. They are safe and legal to use in the UK. Take note that they can only be used when the offset is too high, and cannot be used if the offset is low.
Width and Diameter of the Wheel
The width and the diameter of the alloy wheel can be measured using the equation:
Wheel Diameter x Wheel Width
The Wheel Diameter is the diameter of the wheel. The Wheel Width is the length between the mounting flanges on the wheel.
Understanding Wheel Centre Bore and Spigot Rings
The wheel centre bore is the diameter of the centre hole in the back of the wheel. Most wheels now use spigot rings when their centre bores are considerably larger than the hub lips. Some wheels are manufactured with a centre bore that would perfectly fit onto the specific vehicle without the need for spigot rings. It is vital that the centre bore fits perfectly onto the lip of the hub. If not placed centrally, the drive will experience vibrations in the steering wheel while driving.
We, at Rubbers & Rims, offer alloy wheels of superior make at the best price.
If you are planning to buy Alloy Wheels for your vehicle, contact Rubbers & Rims in Rotherham today!
Call us: 01709328446
Rubbers & Rims, Unit 1, Lyme Street, Rotherham, S60 1EH