The bike rides great! As mentioned both rear wheels pull by the chain off the jack shaft. The derailer and 7 sproket rear end all work for a nice 5 speed rearend for smooth transitions up and down hills. It operates off of the 5 center sprockets. We geared it low so it would climb hills with ease. Most of the time I ride it in 3rd gear. It is very comfortable to ride even though the seat hight is low. Thanks to everyone for the kind comments.