I just don't think you'll be able to get comfortable on it. I'm 6'4" and I ride a 18" hardtail which is considered small for someone my size. I couldn't see myself riding anything smaller but at the same time I don't think I'd be comfortable on anything bigger than a 19". I'd go with the 19" if I were you. That's the best I can do to convince you otherwise but the bikes in your area so, if I were you and that intrested in it, go pedal it around and see how you feel on it. You'll know right away if you feel cramped on it.