Re: super light friction drive for emergency.
Is a great thought, Ace. Small and lightweight. Pretty perfect.
Thing that is a real bummer about 4 strokes is even if you remove the drive chain/belt, it is still not fun to try and pedal. Even worse with the larger ones. Be crazy expensive but was thinking an E-wheel with a solar panel just to keep the batt topped up.
Not at all cost effective but same idea. Your thinking makes a lot more sense.
I really, really hate pushing a bike home.