Vertical Rotor Runout? - Wrist Twisters
 
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post #1 of 5 Old 06-30-2013, 02:16 PM Thread Starter
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Vertical Rotor Runout?

Since I bought the bike I have noticed the left rotor gives the appearance of being slightly out of round. I suppose it hasn't been a big deal because I'm just now getting around to checking it. I'm about to change tires and have acquired another rotor here on wt. According to my cheap old dial indicator, the runout is around .045" and not simply an optical illusion. I checked the right side for comparison and got .014". My question is: is this excessive - enough to cause high speed vibration?

VERTICAL BRAKE ROTOR RUNOUT - YouTube
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post #2 of 5 Old 06-30-2013, 03:05 PM
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I wouldn't suspect it to be an issue, unless it throws the wheel off balance, which I doubt.

But, being a little of a perfectionist, I would use chalk or a sharpie to mark the high spot, then loosen the rotor bolts to try and shift it the other way.

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post #3 of 5 Old 06-30-2013, 03:10 PM
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Are u getting a high speed wobble all the time? Or just under braking?

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post #4 of 5 Old 06-30-2013, 03:19 PM
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Quote:
Originally Posted by Ken Phenix View Post
Since I bought the bike I have noticed the left rotor gives the appearance of being slightly out of round. I suppose it hasn't been a big deal because I'm just now getting around to checking it. I'm about to change tires and have acquired another rotor here on wt. According to my cheap old dial indicator, the runout is around .045" and not simply an optical illusion. I checked the right side for comparison and got .014". My question is: is this excessive - enough to cause high speed vibration?

VERTICAL BRAKE ROTOR RUNOUT - YouTube
The manual says service limits front disc warpage 0.30 mm or 0.012 in

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post #5 of 5 Old 06-30-2013, 03:30 PM
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I'm sure the radial runout that is shown in the video was not there when the (floating) rotor was new. So is there a mark on the OD of the rotor where it may have hit something? Likely the outer ring was knocked out of center. Is the axial runout within spec? (.012")
If tires were balanced with the rotors in the current condition then there should be little effect on vibration.
But in any case i would not like it and would probably replace the rotors.

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