My wife and I have a collection that hovers around 30 bikes. As with Heisenberg's uncertainty principle, it's not possible to know exactly how many there are at any given time.

Since the ideal number of bikes for me to have is always N+1, I regularly find bikes to add to the collection. If one ends up being too duplicative or superfluous, I sell it at the semi-annual veloswap at the velodrome, but I usually feel bad about getting rid of one.

I have numerous European lugged steel racing bikes, several Italian MTBs, five track bikes, and a bunch of three speed city bikes.

I also collect brands: Colnago, Olmo, and various marques produced by the Austrian Steyr-Daimler-Puch conglomerate.