Originally Posted by wstar

Being paranoid about wasting any further track weekends on unexpected brake issues, I was extremely analytical and careful with the new rotor installations. I took dial-gauge runout reading on all 4 rotors and thickness variation data, etc, and did some indexing of the mounting rotation offset to minimize the runout. Everything's way way below OEM spec limits. My worst corner is at .004" runout prior to bedding measured all the way out at the edge, and even that I think was reduced slightly with the wheel torqued on top (as opposed to lightly torquing lugnuts onto the brake rotor itself when measuring). The OEM spec limit is .014" a bit in from the edge (center of pad swept area, basically). So, measurably, these are good rotors in manufacturing quality terms.