Used mountain bike 18'' (seat tube) size M, good quality frame by Specialized. 8 speed. Scratches visible as shown in photos. Gears and brakes all in good condition. It looks a bit old but it's very well made and should last long. I used to get comments on how good the frame is at the campus bike store.

Bike + helmet(almost new) for 200.
Only thing is that it's not on campus and only available for pick up in the city of San Francisco.