WHEEL CENTRE BORE & SPIGOT RINGS
The wheel centre bore is the diameter of the hole in the back that fits onto the flange on the car’s hub. Most wheels have a centre bore that is larger than the hub lip and consequently work on a spigot ring locating system. This allows the wheels to fit a wider range of cars.
Some wheels have been manufactured with a centre bore that will only fit precisely onto a specific vehicle so in this case, a spigot ring is not required. If the wheel does not locate the hub correctly, you may experience issues such as a vibrating steering wheel. This can lead to wear on the tyres and bearings, so customers should remember that if spigot rings are necessary.