Spigot rings

The diameter of the wheel centre from the inside minus the diameter of the hub centre on the car - simples! ;)
 
Or, you could do what I did, contact a local alloy wheel supplier, tell the what car you have, and what make the wheels are, and they'll tell you what size spigots you need, and probably supply them. ;)
 
I recently had to buy some for my purple alloys :)

I didnt even think about doing something as simple as contacting a supplier lol

I ended up checking the cats centre bore online which was 64.3mm then measured the bore of the alloy from the inside which turned out to be 73.1mm

Ordered 73.1 to 64.3 spigot rings via ebay for just over a fiver and gave a big sigh of relief when they came through the post and they were the right size lol
 
I recently had to buy some for my purple alloys :)

I didnt even think about doing something as simple as contacting a supplier lol

I ended up checking the cats centre bore online which was 64.3mm then measured the bore of the alloy from the inside which turned out to be 73.1mm

Ordered 73.1 to 64.3 spigot rings via ebay for just over a fiver and gave a big sigh of relief when they came through the post and they were the right size lol

Just being lazy,but would I be right in thinking my bore would be 64.3mm ? Looking back on another thread Si's (Scunny) was 63.4 !!?........I know, I know , go out and measure it your self ! Also there's a shamfer on the inside of the alloys do I measure from the outer edge or the inner ?
 
Just being lazy,but would I be right in thinking my bore would be 64.3mm ? Looking back on another thread Si's (Scunny) was 63.4 !!?........I know, I know , go out and measure it your self ! Also there's a shamfer on the inside of the alloys do I measure from the outer edge or the inner ?

Ignore the chamfer and measure the inner diameter.