Don't know if it's o.k. to post a link to another forum (if so feel free to admin delete) abeit a zzr1400 one but there's loads of info re discs in this link -
http://www.zx14r.co.uk/phpBB3/viewtopic.php?f=59&t=524
I personally tried the Stealth discs (sh*te) & ended up with a pair of PFM's. Was more than happy with them for the 30,000 miles I used them on the ZZR, no wear to speak of etc. So impressed in fact that I put the warped OEM ones back on when I traded the ZZR in & have the PFM's sat on the shelf ready to fit very shortly as at 28,000 the GTR discs are about shot.
http://www.zx14r.co.uk/phpBB3/viewtopic.php?f=59&t=524
I personally tried the Stealth discs (sh*te) & ended up with a pair of PFM's. Was more than happy with them for the 30,000 miles I used them on the ZZR, no wear to speak of etc. So impressed in fact that I put the warped OEM ones back on when I traded the ZZR in & have the PFM's sat on the shelf ready to fit very shortly as at 28,000 the GTR discs are about shot.