Originally Posted by In Absentia

I used to ride a 2-tooth difference (52x19/21) and I liked the fairly large difference between the two. The 21 was about 72-73" and the 19 was about 67", I think. I would ride the 21 around on long, flat rides and usually around town, casually. But I often felt like spinning more, especially if it was windy or I was going to be hitting hills, so I'd switch to the 19. I liked the 2-tooth difference because it really changed the character of the bike for different rides, something I don't think a 1-tooth difference would do as much.