An unridden (but rideable) bike is a terrible thing indeed...
the entire purpose of a bike is to be ridden, if it is *also* art then that’s a bonus, but art is nothing if not observed or experienced, after all that is the purpose of art, how better to experience an artful bicycle than to ride it? And how better to let it be observed than to ride it where others will see it?
Wall hangers are selfish and wasteful, museums have their place but only for truest exceptional or historically significant items, and ‘working’ museums are the best of all.
Ride them, or give them to someone who will.