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Z1's hands down. The current tire to have in street tire AXing too. I have run them on AXing and track days.
RS2's: I have driven on my brother car. Stick well but are not as good as the newest generation of tire compounds.
I have driven the MX's, not the XS's, I cant speak to them.
In my opinion, no summer (sticky, performance) tire will last over 15-20k when in use.
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