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Need I worry about this scratch? Bought used rotors.

Started by stopintime, August 24, 2009, 05:27:15 AM

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stopintime

August 24, 2009, 05:27:15 AM
I got these in today - there's a scratch - can't feel it when running a finger across, but a nail will.
There's nothing sticking up higher than the rotor surface.
Seller had them checked (don't know where or how) for straightness - I haven't double checked that info.

Need I worry?





268,000 km/eighteen years - loving it

Howie

#1
August 24, 2009, 05:56:17 AM
I can't say anything decisive from the photo, but that rotor looks pretty beat up.  Besides the scratch, there is some nasty stuff around the holes.  As far as the rotor being straight, the only proper way to check on a floating rotor is to separate the blade from the carrier and check the blade on a surface plate.  I doubt this was done.  You might also want to take a micrometer to the rotor to check wear.  Minimum thickness is stamped on the rotor.

stopintime

#2
August 24, 2009, 06:47:56 AM
There's no detectable wear on the edges of the area where the pads grip, so I guess wear is not a problem.

If I don't have them checked (buttons off, on a surface plate) - is the second best method to try them on cautiously?

Would you buy new rotors if you saw this on your bike? (Assuming they perform well)
268,000 km/eighteen years - loving it

DrDesmo

#3
August 24, 2009, 07:29:34 AM
Yikes.  I'd check the runout / deflection before you put those on ... Brakes are the one area of your bike not to pinch pennies on.

Cheers,
Adam
'95 916
'12 800XC

erkishhorde

#4
August 24, 2009, 07:58:11 AM
I don't know much about brake disks but to check for warping can't you also put them on and then spin the wheel by hand to see if they wobble? Those chips around the holes are disconcerting to me and I'd probably replace them if I had the money for that reason alone.
ErkZ NOT in SLO w/ his '95 m900!
The end is in sight! Gotta buckle down and get to work!

ducatiz

#5
August 24, 2009, 08:07:20 AM
as long as they are not warped and the thickness is within spec, that scratch will not harm braking. 

the decrease in grab going over that area will be small.  the chips around the hole are not by themselves problematic as long as the surface is not raised.
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stopintime

#6
August 24, 2009, 11:23:31 AM
According to the seller they're checked and OK'ed by The Frame Man http://www.motorcycleframeman.com/

Does that sound like it should allow me better sleep? (don't know how they check it though)

268,000 km/eighteen years - loving it

ducatiz

#7
August 24, 2009, 02:04:19 PM
double check it with them.. you should be fine.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

He Man

#8
August 24, 2009, 04:00:43 PM
doubt it will make a difference. but you wont know till you clean them up, install them, and put a layer of brake material on them.

WHat id be more concerned about is, why did you buy them if u knew they were in that condition. you can find some pretty good conditioned used rotors out there.

ducpainter

#9
August 24, 2009, 04:07:11 PM
Those look like full floating iron rotors to me. I may be wrong.

I'll run 'em if you don't want to. ;D
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 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


ducatiz

#10
August 24, 2009, 04:21:15 PM
Ducpainter is correct.

These are iron.  Make sure to get compatible pads.  Nice.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

stopintime

#11
August 24, 2009, 06:40:37 PM
Quote from: He Man on August 24, 2009, 04:00:43 PM
doubt it will make a difference. but you wont know till you clean them up, install them, and put a layer of brake material on them.

WHat id be more concerned about is, why did you buy them if u knew they were in that condition. you can find some pretty good conditioned used rotors out there.

Bought from US - I didn't have the chance to see them first.
Seller says he didn't notice and didn't check very hard as they were ok'ed by The Frame Man.


IRON rotors? What make you guys think so?
They supposedly came off of a S2R 1000 and look exactly like in the pictures of it.
All I can read is "Min.th 3.6mm" and the offset seems to be ~5mm. On the back the buttons are the flower shape.
268,000 km/eighteen years - loving it

ducpainter

#12
August 24, 2009, 06:51:00 PM
Quote from: stopintime on August 24, 2009, 06:40:37 PM
Bought from US - I didn't have the chance to see them first.
Seller says he didn't notice and didn't check very hard as they were ok'ed by The Frame Man.


IRON rotors? What make you guys think so?
They supposedly came off of a S2R 1000 and look exactly like in the pictures of it.
All I can read is "Min.th 3.6mm" and the offset seems to be ~5mm. On the back the buttons are the flower shape.

The color and the surface appearance led me to believe they were.

Like I said I could be wrong.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#13
August 24, 2009, 07:49:52 PM
If they're iron, I'd think twice before running 'em with that scratch.
Stainless, I wouldn't worry much.

It *looks* like someone deburred the edges of the holes where the scratch is.
That helps a lot of it's been done.
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ducpainter

#14
August 26, 2009, 01:31:04 PM
Quote from: Speeddog on August 24, 2009, 07:49:52 PM
If they're iron, I'd think twice before running 'em with that scratch.
Stainless, I wouldn't worry much.

<snip>
care to explain that?

I really don't understand why.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


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