245/275 with NT-01's should be fine. I also second my recommendation for these tires, they wear well, have predictable grip and the handling characteristics are somewhere between a street tire and a race tire. Just remember that they take a little longer to warm up than a street tire, and in this warm up phase they have less grip than a street tire, especially in lower track temperatures. I run 275/315 NT-01's on 9.5/10.5 18" inch rims.
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