How many of you have actually measured your rotors? The manual says replace at 3.9, that’s .2 mm wear from new. .2mm is 2 sheets of paper. Could someone tell me how this small amount could make a difference in performance or safety? I am sure there is a reason. I would sure like to know. The bike has 34k mi. this is the second set of pads. The first were stock and the last ones were the Kevlar organic. I commute stop and go traffic and I hardly use any rear brake so I would assume the wear is normal. I don’t have a problem replacing the rotors, other than I am a cheap bastard. But I would like to know what the issues are with thinning discs from one who really knows brakes. I am guessing thin rotors are more susceptible to warping and eventually the calipers won’t grab, but .2mm, please. I have the same thoughts with our car when I am told I need new rotors every time it goes in for brakes