I recieved my Shinko 005 Advance tires from Motorcycle Superstore - Motorcycle Accessories and Motorcycle Gear and yes they are Z rated. Well I had to teach an MSF course and it was raining like cats and dogs and the tires held up well in the rain, I didn't feel the tires slip once. I was leaning and everything and the tires held up. Then I had to ride back from the course to my place which is 45 mins away and the ride was smooth and corners very feel and great feedback. I'm sold on those tire.