The motorcycles most recognized by collection curators are unlike the most popular motorcycling articles, and in fact, if you look at how many redlinks there are on the lists for The Art of the Motorcycle and the National Motor Museum, it's clear that Wikipedia editor interest strays far from what the experts tell us. A key goal in all this is to draw attention to, and correct, Wikipedia's systemic bias in choosing which bikes to make articles about.
But we also need the list pages because there are so many redlinks, and without the lists you couldn't see the entire collection catalog, and we need the categories to clearly see the overlap between collections at the bottom of the article's page. (It's unfortunate that we can't easily see how many redlinks there are which overlap collections, but that's a technical limitation). Also note that Wikipedia:Categories, lists, and navigation templates states that redundant lists and categories are synergistic, and not in conflict, and that "...arguing that a Category or List is duplicative of the other in a deletion debate is not a valid reason for deletion and should be avoided."
Please read the article The Art of the Motorcycle for extensive detail on how influential this series of exhibitions was in the motorcycling world, and why membership in the catalog is evidence of the motorcycle's historical importance. --Dbratland (talk) 02:58, 3 April 2011 (UTC)