I am unsure if this method has been posted but I find it to be my favorite: In google: search term site:craigslist.org/bik/
ex: 531 site:craigslist.org/bik/
Type your search term or multiple terms. them one space. then site:craigslist.org/bik/ This searches only the "bicycles for sale category" for every city. I like it because I can type in any search term. Like 531 or ASC. Instead of just a brand.
Jordan Lorenz
Tucson AZ