Awww I'm sad. I was hoping it would clamp on the top tube.
I am so short that there isn't even enough post under my seat for a rack, never mind a clamp. I am looking for a design that will keep the wheels free rollin' (to make lubing easier), and not interfere with any mechanisms I may need to play with - brake tension, wheel release, seat post, pedals...
I know, I'm terribly fussy. Even used stands are horrifically expensive.