I have a '57 plate Toledo Stylance 2.0 Tdi, the wheels are 18" Seat Sport BBS, I don't know if these are stock. Anyway I've just had four Goodyear F1 Asymmetric 3Xl (225/40 92 Y) fitted but have no idea what the correct pressure should be. They are currently 34 at the front and 36 at the rear, is this okay?