cheers guys i'll probably destroy them on the track before i get a chance to try them on the road. i'm glad that you use pre-loved racetechs nbs996, as someone told me that you should'nt use used tyres cos when they get hot then removed then put on a different bike it can cause to much stress on the tyre wall, have you heard that? i know of a couple of others who use these racetechs and they haven't had a problem!