Alloy Wheels And Tyres - Put A Rim On Your Car That Has A Larger Good Offset
Consider the wheel on your car and in particular the holes where the bolts hold the wheel to the car
Although the pitch circle diameter strictly only refers to the diameter of this circle, the pitch circle diameter specification for a set of alloy wheels will also tell you the number of bolt holes, which will usually be either 4 or 5.
Alloy Wheels And Tyres - This does not however mean that the wheels from one car that have a pitch circle diameter of 4x100 will necessarily fit another car whose tyres have a pitch circle diameter of 4x100. This is because they may have a different spigot size.
The spigot is located in the centre of the wheel hub and is what holds the wheel in place while you locate the bolt holes.
On most after-market alloy wheels, the spigot hole will be bigger than the spigot on the wheel hub. To get around this you will need to use a spigot ring, this fits over the spigot on the wheel hub to increase the size to fit correctly within the spigot hole on the inside of the alloy wheel.
It would be possible to attach a wheel to a wheel hub without a correctly fitting spigot, although it would be tricky to hold in place while screwing in the bolts. This would not be advisable for another reason though. The other purpose of the spigot is to carry most of the weight of the vehicle. If it did not fit correctly all the weight of the car would carried by the bolts, which are not designed to do this. They would likely sheer off if you drove the car too hard or braked too heavily, which is obviously not good!
The offset is the measurement, in millimetres, between the centre of the wheel (not side on, but turned to face you) and the bolt face (this is not the same as the outer most edge).
There are two different types of offset. There is a positive offset, where the bolt face is closer to the outside edge of the wheel than the centre of the wheel, this is most common on normal road cars. And there is a negative, where the bolt face is closer to the inside edge of the wheel than the centre of the wheel.
Therefore, if you put a wheel on your car that has a bigger positive offset than the previous one, the wheel will sit further in towards the car. And alternatively, if the positive offset is smaller, or even changed from a positive to a negative offset, the wheel will sit further out from the car.
For performance purposes you can improve grip and traction by going for wider wheels and tyres, but in order to do this you will need to go for wheels with a smaller offset to allow for the extra width in the wheel arch. If you went for wider wheels that had too high an offset, the tyres would probably make contact with the inside of the wheel arch, causing damage to both the tyre and the arch.
When buying a new set of alloy wheels it is easiest to select a size that is equal to that of the current wheels, so you would replace 13" steel wheels with 13" alloy wheels.
But you may want to change the width and profile of the tyres for better performance. Again it is best to try and approximately match the overall diameter of your current wheels and tyres. To work out what you can go for you can use the specifications found on the side of your tyres.
About the Author:
Alloy Wheels - Mad Motors was started by Robert Dugan, way back in 2003. Since this time, we have grown to become the number 1 online company for aftermarket car accessories. We are continually pushing to bring our customers the largest selection of online parts, combined with the lowest prices possible. We also believe that customer service is very important and our sales team are always available to speak direct to our customers.
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Mad Motors
Emscote House,
39 Haugh Shaw Road,
Halifax,
West Yorkshire.
HX1 3AR
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