i use 190's now(NTECS are 190's or above, they don't do a 180).and thats what were on the bike when i got it, so thought i would at least try them. i also think the gsxr trophy lads are using them this year. TBH i haven't used them back to back against 180's. It seems a lot more 600/750 riders are using 190's in general from what i can see. Don't really know if it's because it's better of the fact that a lot are getting 'scrubbed' race tyres etc.