I go through about 3 sets of tires/year and have tried a lot of different tires on my Z as well as other people's cars at the track.
I think the ZII's are the fastest cold and thus probably best for autocross, but they don't like heat. (I ran ZII's on my brother's Mini)
Star Spec ZI's may have been the fastest tire I ran on my Z. (Haven't ran ZII's on my Z yet)
The Rivals are "good" cold and hot, but the set I just took off of my Z ran out of grip long before they ran out of tread. (Heat-cycled kind of soon)
I have only driven the Bridgstones on other people's cars and liked them, but I have been told by other competitors that they are not as fast as the other options.
I'm now running RS-3's and they are a top-tier tire. (at least when they are new)
Last edited by Z1NONLY; 02-18-2015 at 06:40 PM.
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