Which Spigot Rings Do You need?
Spigot Rings (Centre Rings) are used to ensure that an alloy wheel is correctly centred on to the hub of the vehicle. If an alloy wheel is fitted without spigot rings it will probably cause the wheel to vibrate, make it almost impossible to balance, increase uneven tyre wear and in time will work the fixings loose. So, fitting wheels without spigot rings can be very dangerous.
Unfortunately most wheel manufacturers use different size spigot rings for their particular wheels so there is no “one size fits all” available.
In order for aftermarket wheel manufacturers to cut down on the amount of different wheel part numbers they produce they use spigot rings to adjust the centre bore of the wheel (centre hub fixing hole) See Fig 1 and 1a.
This cuts down on the amount of different wheels customers need to stock and by changing the spigot rings a particular wheel can be fitted to a wide range of different vehicles.
How to identify the centre hole in an alloy wheel
It is important that you identify which type of centre hole you have in the wheel you require a spigot ring for.
There are 3 different designs of centre hub fixing holes which cover most alloy wheels.
a. Tapered centr hole (see Fig3)
b. Stepped centre hole (see Fig4)
c. Straight centre hole (dedicated centre bore) This is an O.E type fixing where the wheel is made to fit a dedicated vehicle and a spigot ring is not requied. Mostly used on "original equipment" wheels produced by car manufacturers.
How to Measure the Centre Hole in Your Wheel:
To find the diameter of the centre hole in your wheel you will need to measure the centre hole from the back of the wheel. You will need to measure the actual hole, not the taper of your wheels have a tapered hole, See Fig3 and 3a. If your wheels have a stepped hole in the back of them (See Fig 4 and 4a) you will need to measure the widest point.
Now you have the measurement of the centre hole in the wheel you will need to find a spigot ring which has the same outside diameter of the centre of your wheel.
- The outside diameter of the spigot ring should fit the outside diamter of the centre hole in the back of the wheel.
- The incide diamter of the spigot ring should fit the outside diameter of the wheel hub on the vehicle you intend to fit the wheels to. Now you have identified which spigot ring you need, look at our application guide to find the correct spigot ring set for your vehicle.
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