I own a motorized auto shift Land Rider. I installed a Staton Inc crank drive system. You can view images of the bike by looking up LR Jerry. Of course upgrades had to be made in order to motorize the bike but this is common when putting an engine on any bike. Because of the crank drive system the bike is now a 21 speed instead of a 14 speed. I manually shift the front three gears and the rear seven shift automatically. The chain, twist shift, rear hub and freewheel (not a cassette) was replaced. I live in Tennessee where there's lots of steep hills and long grades. Because of my setup I can ride where single ratio drive motorized bicycles can't. Most of the peddle only riders have very lite bikes are young and very fit. I'm 49 years old 6'2" and 235 lbs. I've been able to go up any hill 7+ mph. Level ground 30 mph. And downhill 45+ mph. Since the frame is a heavy duty one its able to handle the high speeds. I've had my critics but the biggest thing against them is the bike actually works. In the end ride what you enjoy. Open minded creative people will always find ways to improve things. Different doesn't mean inferior.