I run 275/35R18 on 9.5" Enkei for wets and 27/65R18 Michelin Slicks (actually Porsche Cup fronts) on 10" Braid Forged. Alternative slick is Pirelli 285/655R18.
Square all round makes for better balance - Unless you are boosted and running mega torque, I'm not sure that anything bigger than 275/285 provides a benefit
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