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Brake rotors, how thin is too thin?

ALdad 06

ALdad 06

Tuned and Synch'ed
Joined
Dec 29, 2008
Messages
29
The pads on my 2000 sport need replacing. Rotors are about 3.4-3.5mm. What risks or issues am I taking in running one more set of pads maybe about 15k miles? I commute daily the bike stops just fine. But the pads are really thin. Will one more set of pads 15kmi. I am guessing will shave another .2 or .3 mm off rotors. Tell me if I am stupid in pushing it . :eek:
 
According to the manual, wear limit is 3.9mm. Not very much wear allowed as new is 4.1mm and thin to begin with.
 
How many miles total and what kind of pads have you used to wear the rotors down that much?
Yes, I would say you are pushing it already.
 
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 .
 
ALdad 06 said:
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 .
Click to expand...

I believe the thickness is for hear dissipation and strength. I'm not a fan of the original rotors. Get some good 5mm thick Brembo rotors and you won't have to worry about replacing them for a long time. Todd can help you out with that. Once the rotors get thin, I get concerned over their strength.
 
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