I've been racing the 09-12 zx6r for 4-5 years now in CCS and have experimented with geometry (taking input from other racers and race mechanics). I've noticed (at least for my style of riding) this bike likes A LOT of trail so you have to raise the front quite a bit. I am running the 30 MM ohlins front cartridges on mine (which when installed increases the front fork length by 10-11 MM) and in addition to this I drop the forks another 5 MM so they are flush with the top triple, so we are talking about a approximate 15mm increase in front ride height, and a stock rear ride height (I actually just removed my factory shim to lower the rear ride height by 2-3 MM at the shock, because I switched to Pirelli from Michelin). I've found that if you increase the rear ride height, it makes the bike transition faster, but I get too much head shake/tank slapping throttling out of the corners, so I keep the rear low. Also with the rear raised, I feel like I get way more mid corner chatter, and front slides. I became quite good at saving front end slides, until I lowered my rear back down to stock height (increasing trail) and I feel this gave the bike much needed front end grip. With the stock rear ride height I've also found that you can trail brake much much harder without lifting/sliding the rear. YMMV. Keep in mind riding styles vary greatly so one person's setup may not work for another, also your body position and body size/weight play huge roles in this as well.
Last edited by sonicnofadz; 04-21-2016 at 05:53 AM.