STEP into the tight entryway of Noah John Gellner’s compact studio apartment on the Upper West Side, and try to squeeze past the everyday bicycles perched on their hooks. There is his road bike — a titanium rocket from Colorado — and hanging below it, a customized mountain bike, also titanium.
Leaning against that bike is another that belongs to his wife, Chikako. Two others hang from the opposite wall, and on a tall platform in the living room sit seven more — rare examples of early mountain bikes.
“O.K., let’s see,” said Mr. Gellner, counting off just how many two-wheelers he has wedged into the apartment. “Five out there, and seven in here, then there are the frames” — metal skeletons that will eventually be built up to their former glory with the help of saddles, brakes and freewheels that are waiting in boxes tucked around the place.