All the cars we drove were on 20-inch wheels with 35 profile tyres, and the ride was reasonable, but the Spanish roads were relatively smooth. If you're going to worry about ride quality through potholes in a car capable of 170mph plus, you're looking at the wrong kind of cars. If thinking F-Type you would have to restrict yourself to one on 18" wheels, which means the entry model 340PS V6. Same goes for Boxsters and Caymans.