Haven't tried those, but have a full set of Kumho KU39 at that size on the GT4 and they're great
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- stood up to several rounds of TSS as well as regular road use, very impressed.
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I've since put a pair on the front of the Caldina and they're equally good
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- ony thing is they're a bit fussy to balance, had to get the fitters to redo a couple of them.
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Jake