The rack would hold two complete vintage race bikes, not just frames. Given their intended purpose they are fairly light with, no fenders, no racks (I take off their seat banana bag when not riding). My goal is to figure out a secure means of hanging the bikes one above the other with the least amount of holes in the wall. Sounds like a gravity rack may be the best bet? What brands of gravity racks have you used/would recommend? Given the carpet flooring I would get the plastic comb style protectors to both anchor the legs of the gravity rack in the carpet while protecting the carpet.