You asked about the JD Rajor. I've used one for 18 months. 8" wheels, nice ride. About 25 lbs. Does not fold. Bars drop down. Had to hand-cut the old handlebars because they did not fold, suck out. (This picture is wrong - it is not the bike they shipped!).
Beautiful frame.
However it has a fatal flaw: the freewheel. It is an orphan part. Mine gave out on me and froze the gears. No cycle shop in the world carried a replacement. Bike mechanics said it was junk! It could not be rebuilt. I went on the web to find a similar part. Only one shop carried a similar part, not associated with the JD Razor at all. Luckily I found a substitute, the freewheel for a motorized mini-cycle. Even that relacement was , er, substandard. The gears still grind out, the freewheel has locked up several times (stop, and rewind!), the gears are not really capable of re-lubrication, and are unreliable.
The lesson here is that there are many mini-bikes. Be sure to check out the availability of gear/shifter parts first. If they are odd, you can not fix it. Better to get an A-bike (all parts are available) or a multi-gear bike with standard parts.
Bob
Why A-bike? It's like a boat: A boat is safest in the harbor. That's no reason to have a boat!