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Front brake rotors


Pat Buzzard

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Pat Buzzard

I have the opportunity to replace my worn out front brake rotors with a set off a low mileage R bike that's being parted out. I just want to verify, what thickness to these rotors start at, and at what thickness are they considered unserviceable?

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My Clymer manual states the thickness as 5.0 mm (.1969") standard and the service limit as 4.5 mm (.177"). Also says the min thick *should* be stamped on the disk. Maximum runout limit is .12 - .15 mm (0.0047 - 0.0059") (don't know why there is a range on the max runout, I thought it would be a single maximum value.)

FWIW the outside diameter is listed as 320 mm (12.589").

 

Regards,

Rick

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Maximum runout limit is .12 - .15 mm (0.0047 - 0.0059") (don't know why there is a range on the max runout, I thought it would be a single maximum value.)

 

Afternoon Rick

 

Max runout is kind of deceiving (.15mm) over the entire 360° disk sweep is not a big deal but (.10mm) R.O. measured on a 90° (1/4 turn) sweep is going to give braking issues. (it kind of boils down to how quickly it goes from low to high & back to low)

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