If they are the Ø: 257 mm ones then they start at 20mm... so if they are I would suggest you are measuring the out lip and not the actual disc thinkness
If they are the Ø: 257 mm ones then they start at 20mm... so if they are I would suggest you are measuring the out lip and not the actual disc thinkness
there is a bit of a lip but i measured about 10-15mm in from the edge and the discs have been on the car for about 30k .
i'll go and recheck maybe i read the micrometer wrong