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post #1 of 5 (permalink) Old 12-21-2005, 01:38 PM Thread Starter
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Rotor life

I have some pretty old rotors on my track bike (they have about 33,000 miles). I recently acquired a brand new set of Carbone Lorraine C43 brake pads. From what I've heard, the C43 pads are excellent pads...which is why I do not want to mount them on old rotors that are probably near their minimum thickness.

I'm not really financially ready to take the plunge into Wave or EBC Prolites. So, I've been looking at buying some used OEM rotors. I found a guy selling some rotors with a 0.006" runout. What does that number mean? I plan on doing 8-10 trackdays next season...will the rotors have enough life in them to last that long?

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post #2 of 5 (permalink) Old 12-21-2005, 03:24 PM
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you should be more concerned about thickness and if the rotors are warped or not
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post #3 of 5 (permalink) Old 12-21-2005, 06:45 PM
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This is a pretty easy one. Go buy yourself a cheap micrometer ($30), that way you can tell exactly what you've got. The "minimum" thickness is listed on each rotor and you should get a ton of mileage out of any stock rotor regardless of pads used. I put quotes around minimum because they are still good even below that. As a matter of fact you'll want them as thin as possible without them warping for less weight.

A .006" runout means that with respect to the rotor's plane there's a max variance of .006 of an inch... a wobble in layman's terms. That won't even be noticeable and the fact that the person took the time and knows how to do that is a good sign.

I recommend AGAINST wave or any other heavier than stock rotor (yes, HEAVIER). They are overkill without the proper suspension, tire and rider combination.

PS - Factory teams have been milling their rotors for years now. It's one of the many small things that add up to a FAST bike.
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post #4 of 5 (permalink) Old 12-21-2005, 07:26 PM
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not sure, if there not falling off get new brake pads:icon_lol:
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post #5 of 5 (permalink) Old 12-21-2005, 07:32 PM
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Actually the 0.006" is well within the recommended 0.30mm service limits. As long as they're not cracked or grooved you should be fine.

The service manual converts the 0.30mm to inches incorrectly. The book has 0.0012" and it should be 0.012".

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