One other point about motorcycles aerodynamics and cross winds is the mass of the bike. If you have two bikes with the same side aera to work on and one of the bikes is twice as massive, then the more massive bike will be less affected by the cross wind F=ma. That is why; as you reduce the mass of the bike getting the aerodynamics right become ever more critical as well as the location of the center of gravity and the center of pressure... Take a look at the side area of one of the big touring bikes like the
goldwing and then ask the owner what its like in a cross wind? I ride with a friend who has a gold wing and it leans much less than my GS500 or my KLR650 both of which have less mass and less side area.
