I bought a ZX6R in 2018 so I could get some proper track experience without worrying about chucking my street bike into a crash barrier. Last year, I got a day in at Area 27 (hotlapping beginner/intermediate sessions) and one at Mission here in BC, running Q4's with a 180/60 rear - I'm really happy with the tires. I'm a beginner/intermediate, so I'm not quick enough to take advantage of slicks yet. I've got a track day coming up next week at the new circuit on Vancouver Island - looking at the tires, I'm not sure if I'm at the point where I need a new set; I haven't gone through tires fast enough to gauge when it's time to replace them. As a sidebar - I've noticed it's really hard to get to the edge of the 180/60's versus the 180/55's - I was scraping the stock rearsets last year but I still have a 1/2 inch left on the tires.