5'-9", I've got bikes between 14" and 18 1/2". It all depends on what terrain I'm riding, for how long, and most importantly, with who. An afternoon trail ride with MTBers, I'll take something 18"ish like the Dekerf, the Sovereign, or one of the AMP bikes. If it's a short ride with the guys I raced MX with on the tight nasty trails on the escarpment above my house, I'll ride the 14" Catalyst. It will be more or less an hour long 4-cross race, so comfort isn't a concern. Carrying cornering speed so you don't get stuffed is.