It is a Medium, or about 16.5" me thinks.
I have a well cared for Haro X3 frame for sale.
Has a 1.5 head tube, comes with a new Cane Creek headset.
I built this up http://resource.pedaltrout.com/old_site_images/141f63413384ba0b49da78a1c0aeb5ac.jpgfor cross country, but this bike was designed with big hits in mind.
Has a Manitou SPV Swinger shock on the rear with 4" of travel.
Asking $200, but open to offers or interesting trades.
Size?