I'm basing that on one rear Z6 during a trip to AR. I took the Pig Trail out of AR on the way back home in a pouring rain, and that rear wanted to cut loose on every turn. I suppose it could have been a bad compound in that tire, but I swore off of them either way. Keith from TX was riding back with me, and he saw just what a tough time I was having with it. The really sad thing is that I wasn't pushing the bike at all. In fact, I was trying really hard to take it easy and not wash out in a turn. I ran the Z6 front and 880 rear to Moonshine this past weekend. So far, that's 1,000 miles on this second setup, and they performed great all weekend.