Spigot rings
Why a wheel has a centre bore, how to choose spigot rings and what the tapered seats on the bolts are for.
From the lead article
The question of spigot rings usually comes up when a car owner plans to fit non-standard wheels (that is, wheels not directly specified by the car maker for that particular car), some of whose figures (in particular the centre bore) do not quite match those of the standard wheels.
Articles in this sectionIn reading order.
- Spigot rings for wheels: everything you need to knowOpinions on spigot rings are divided: some say they are unnecessary, others that they are absolutely essential, and of good quality at that. So which is it?introduction, 261 words
- Why does a wheel need a centre bore?The centre bore, and the centre bore alone, is what a wheel needs for fitting correctly onto the hub, not the tapered seats on the bolts (or nuts), whatever some sellers may claim.416 words
- How do you choose spigot rings?If a wheel’s centre bore does not match the size of the hub’s spigot, the problem can be solved by fitting special spigot rings, which are sold at tyre centres.664 words
- Why are there tapered seats on wheel bolts and nuts?The tapered seat on wheel bolts (or nuts) is not designed to, and cannot, guarantee precise centring of the wheel on the hub.469 words