I know close to nothing about bicycles.
I have a midrange performance folding Dahon (20x1.5) and a hybrid GIANT with racing tires (700x25c). I was riding with my friend and he was using my GIANT while I was using the Dahon. His coast (no pedaling) is equal to my pedaling. I know a 20" Dahon is no match for a performance bike BUT what accounts for the BETTER coasting?
I road the GIANT this morning and it coasted very very far. Blocks and blocks!