I'm 5'8" and ~250, and bikes roll well because they usually have decent bearings and they are geared at a ratio of much more than 1:1.

Even if they aren't I consider mine free weights with stripes and a fake gas tank and I don't pay $100 a month to pedal really fast and go nowhere (in a building with windows so they can see you, and music I might not care for).

I call that win-win and I am 7-8x as heavy as my bikes.