The Trek used bike is a 18" so I decided it would be to tall for me. I'm only 5.7-8" tall . I read some post about bike sizing and I need a 16-17 tops. I looked at a new specialized hardrock at a local store today it was a 17" for 399.00 I road it . It was pretty nice. I think a 16" would be better if I could find one.