Spook...sorry but i have been a pratt! 😖 They are 40s!! I spend too much time with cars and tyres sizes in my job. But Fyi the ride is considerably better than the standard Goodyears! I went for the Mich as the walls and tyre edge last so much longer than Contis etc..which tend to round-off on both the road and general tyre testing on the Track.Yoko do an A-052 of the same size which would give amazing grip and feel if that's what you are after.I have them on my Exige S.What's the ride quality like on 45 profiles? Noticeable improvement?