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Alloy Wheels – Getting Technical Ref: 250a

alloy wheels – Getting Technical Ref: 250a


Pitch Circle Diameter (PCD)
Firstly, you need to know the alloy wheel PCD dictates how the alloy wheel bolt holes line up so it is important that this is correct. An alloy wheel PCD of 4×100 meaning 4 bolt holes drilled through the centre of a 100mm circle. Another common alloy wheel PCD is 5×114.3 meaning 5 bolt holes drilled through the centre of a 114.3mm circle. If this is different on your chosen alloy wheels you won’t be able to bolt them on! However, we supply many models blank. This means that for a small extra charge your chosen alloy wheels can be drilled to fit your car.

Most European cars with 4 studs have a alloy wheel PCD of 100mm (Vauxhall, Volkswagen, Honda & early BMW), Fords & Peugeots have a PCD of 108mm. Also consider whether your car has metric or imperial hubs. Real Minis & MGs have a PCD of 4″ which is pretty close to 100mm but not exact so you couldn’t swap one with the other. Check the hole in the centre! Many aftermarket alloy wheels have a plastic ring in the centre to take up the gap. Measure the hole in the centre of your vehicles own alloy wheel and compare it to your chosen alloy wheels.


Offset (or often referred to as ET) is the distance between the centre of the alloy wheel and the edge of the rim. This has to be pretty much the same on your new alloy wheels as your own as it will effect the way your car handles.

Positive offset is when the hub mounting surface is toward the front or wheel side of the alloy wheel. Positive offset alloy wheels are generally found on front wheel drive cars and newer rear drive cars.

Negative offset is when the hub mounting surface is toward the back or brake side of the alloy wheels centerline. “Deep dish” alloy wheels typically have a negative offset. Another reason to be aware of the offset is if the alloy wheel is offset too far one way or another it may contact the wheel arch or suspension.

Offsets can be corrected by machining the alloy wheels or using an appropriate spacer. Please contact us for more details and pricing.

Wheel Size
Finally, consider the overall diameter. As a rule, if you can achieve the same rolling diameter your original alloy wheels, everything should be fine. Fitting low profile tyres will allow for an increase in alloy wheel diameter. All our prices include low budget tyres. Obviously, speaking to other owners who have fitted larger alloy wheels will help you decide how much of an increase your car can take. Remember a different rolling diameter will affect the reading on your speedo.
Use our tyre calculator to show you what the percentage change in your speedo reading will be. is a website dedicated to alloy wheels and tyre packages. If you’re looking for a quality alloy wheels, black, white or chrome, for your vehicle check out one of our dealers online shops. Working closely with our key dealers, offers a huge range of products. With over 50 years experience between our staff in the alloy wheels industry, rest assured you’ll be getting high quality alloy wheel products, speedy and spot-on delivery. To order or to find out more, contact one of our dealers or telephone: 01268 560126, alternatively you can email your us at: