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I've cut seveal 1.85 60's on F1's in my '03 Cobra. I attribute it only to running behind big tire guys. Sheer luck in my case honestly. 2.0's are the norm.
Defintly a big tire car helps. When i cut a couple 1.91-1.92 couple weeks ago at Crapitol, I followed a big tirre. This Friday though track prep was just good, with a few decent tire cars, but only time I hooked was following a street tired vette