I have two of them and they are really sturdy units. They ride very nice with the only disadvantage I see is the ability to not stand up and pedal due to the forward stance of the bottom bracket. Other than that, quite easy to use with the backrest the power required is ok being able to push back on the rest. They offer a electric version. Has a motor mounted on the bottom driving the crank and then on to the rear gearing. Mounting a engine on them would be no problem at all just require some management of room and planning etc. I plan to make a trike out of one for there is a kit to do that with. I like the bikes and they cannot make them fast enough and I do think, not sure, they come from China. Don't hold me to that but then what dosen't come from there now days. gphil
