If you allready are moving 50 and have power to spare then you are really going 60 . Just do it . Lace a 16 inch wheel onto a 14 hub and go a lil bit faster . 2 , 3 , 5 , whatever , you will go faster . Power pushes you faster ! Variator mods can make your gearing so that you need more power to push it further . just do it . MMMMMMMMMMMMMMMMMmmm k