I have the S4 disks as i am doing a custom upgrade for the fronts. They are 30mm standard thickness on them it has 28mm min thickness written on them. Does that mean after 1mm has gone from each side there useless?
Thing is i have had them skimmed to 28mm anyway to fit the calipers im using just a technical metal\engineering question really.
Its not going to stop me using them as the standard ones i have now are warn at least 1.5mm and stop me with no problems and there rusted to fcuk.
I just wondered why they had it written on them is it also becasue there cheap copies?