Best summer tires I've had were the Yokohama AD08's. They're extremely grippy but they have a few drawbacks. They need to warm up a bit before giving full grip, they're not nice in the rain, they're loud, they wear quickly and they're expensive.
But short of going with R-Comps they're probably the grippiest road tires out there. And now they've released their new AD08R which performs better and wears better too (apparently).
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