The high weight of the Du vinci might be to ensure durability in use with electric scooters or it may simply need refinement.Engineering costs money.Drop out width is 135 mm.Could this be used to convert a 6 speed derailluer Bicycle?!This could convert a sturdy 6 speed cruiser to a functional tourer just change the tires add some luggage capacity and Voila!( excusez moi Francais) If it is as good as they claim it will revolutionize the bike industry if allowed to.