I track a 2013 Brembo GT; remounted a set of 295/40-18 Falken RT660 tires on Apex 18x11 wheels in 2023. I have another set of identical wheel with 305 Pirelli slicks. The 295/40 tires match the diameter of the slicks and give a little more ground clearance on the street. My question for the group is if I went to a 315/30-18 tire, is that a significant improvement in grip on the same size wheel? They are 25.6" diameter vs the 27.4" diameter of the 295/40 tires.
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