hihi I did a defensive/advance driving course yesterday, and they recommend road tyres to be 40psi for all sizes, to reduce tire flexing (from a purely safety point of view) I will dig out the notes later about why it should be 40PSI Another thing is, when you pump your tyres, use your own PSI-meter, because the one at the servo is inaccurate (you will notice it if you get 3 separate readngs using the same meter, it will most probably show different values each time