12 to 14 mils
sound the pavement
You should not be travelling on a pavement at 70 mph!
Normal wall paint should be applied at a thickness of 4 mils to dry down to approximately one mil thick. This is true with either oil or water-based coatings.
match
Slow down but proceed forward and slowly steer back on to the pavement.
Off of the pavement
The rear rotor thickness should be three quarters of an inch, when new. The rotor should not be reused when the thickness is less than one half inch.
Technically its width but if you are talking to someone they should know what you mean by thickness.
Apply the brakes immediately and swing the back onto the pavement quickly
I use a micrometer the rotor should have minimum thickness stamped on the rotor is inches or millimeters
The minimum thickness should be cast somewhere on the rotor.
Ideally, seven years old, 22 inches thickness, about 50 inches above the budding point is where rubber should be tapped. Thickness of the tree is more important than age.