I'm nearly 70 y/o and 5'1" and RAD recommended for my height the RAD Expand 5, I can put both my feet on the ground (more the ball of my feet), but I feel stable at a light and am ready to go with a little throttle. My pedal stroke is "ok/adequate" but if I could use some more length, and wish I could put the seat back (not up or down) a bit, I might have a better pedal stroke. However, I put the small basket on the back (and it is very useful) so I don't have the clearance to put a different seat post "layback" style. But I am riding more then I have in the last 5 years and very happy with the choice (Read my post on that I did change out my shifter and upgraded the derailleur). Now nothing stops me except the excess heat.