I think 20's are the best size, but definitely see the attraction of the bigger wheel. When I switched from my 18s I wanted to go 20s, but was worried about ride quality. I ended up going 19s and the ride difference was very noticeable. It is harsher, noiser, and handled a lot better and a little worse. The staggered setup gave me a tram lining effect that I do not like. I have put up with it because I like the looks and I haven't ridden any tires on my 19s except the used Diamaris that came on them. It is almost tire time and I'm hoping they make the difference.