BTW, Ms. BC, I have run 285s on the rear ever since my first tire change. They are a perfect fit for the 10" wide sport wheels. I think 305 has just hair too much "stretch" look for my taste, although I really like the look of super wide rear tires
I wanted to try 295s, but the Nitto Invos don't come in that size. If I ever start to auto-x and/or track the Z, I will definitely be experimenting more with tires. For now, the wet weather performance of the Invos has me sold for DD