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Hello,

I'm currently in the process of installing a gsxr front end on my k6 650s. My question is if anyone is familiar with rotor thickness spec. I know that 5mm is considered time to replace on the gsxr's. With my handy dandy micrometer I'm measuring thickness from about 5.38mm to 5.44mm.

Is this too thin? I'm not all that familiar with how fast a rotor can wear out. Also can anyone suggest an easy way to tell if they are straight enough for suitable use? I got them off ebay so who knows!

Thanks!
 

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If the minimum thickness is 5mm and your rotors are 5.38/5.44mm they are good.
I think that new they are 5.5mm.

They are to thin if they are below 5mm (>4.99mm).

You can not tell if they are straight by looking at them, you need to mount them and ride it, if they are bend you can feel it. You can also check them on the bike with a dail gauge. you can measure on the outside off the disc while turning the wheel.
According to the SV650 manual:
Front disc runout : Service Limit : 0.30 mm (0 .012 in)
 
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