As I posted in other threads, the only folder I ever owned is Dahon Vitesse D5. I had 30 miles in Martha's Vineyard (an island south of Cape Cod, MA) very easily and I could have another 30 if I had better lunch, and maybe another 30 if the day was longer. If I had extra $400 in my pocket I might have bought a Mu XL instead, or maybe not.
I live in a city with notoriously very bad road with lots of broken pavements, and brick sidewalk. The only mod I found essential was to replace the saddle with a spring saddle. I bought Planet Bike Cruiser for some $30 and that was enough. Worth the extra weight.
So, for 20 miles on flat, paved road, I think 20" is perfect. I also commute with this bike every day, and find 20" to be easier than regular bike when I have to stop frequently for lights, jaywalkers, etc. and accelerate again.
I describe my bike with Planet Cruiser "more fun to ride than a girlfriend." This is very popular with most guys and half of girls. The rest of them ask if there is a better way to put it for girls.... "Don't get screwed by Dahon customer service!"
Last edited by megaptera; 09-21-06 at 03:07 AM.