Hi all-
I just measured my rotors (e36 m3): they are at 27.05mm thickness. The Bentley specs that minimum thickness is 26.4mm. (this is front rotors, by the way).

Is that enough to do one autocross or should I replace the rotors before I race?

thanks!
dan

You shouldn't be on the brakes at an autocross enough for this to be relevant. But change those rotors out soon.

not a prob; i've run them below min spec w/o incident (oops)

You can run them down to minimum no problem. I've seen cracked rotors on track but they had run them down to 23mm :D

As long as you don't have excessive cracking, they'll be fine. I just took a set off that were at 26.1 and had no signs of cracking. I wouldn't recommend going this thin. This is on a DE track car.

for autocross, definitely not a concern, though i'd order a new set so can change them out soon. just don't do any DE/HPDE events with those rotors, but i'm sure that's common sense.

for autocross, definitely not a concern, though i'd order a new set so can change them out soon. just don't do any DE/HPDE events with those rotors, but i'm sure that's common sense.
27.05 is not even close to min spec. I wouldn't think twice to do a DE with those rotors so long as there is not any significant cracks.

No worries - you're well above spec. Replace them at your convenience.