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I believe 1mm is equal to about .040", which is a lot in terms of surfacing unless they're really trashed. I wouldn't surface them just because of slight grooving, only if it's really bad, or if they're out of plane enough to cause the pedal to pulse. I think there's way more surfacing/replacing of rotors than strictly necessary form a performance point of view.
Andrew
 

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Rear rotors on a transaxle car are not something to be lightly considered for removal. It's a big job.
Andrew
 
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