I am not sure I follow you here- do you mean like 'bicycle', 'motorcycle', 'tricycle'? Or what color the bike is?
How about ads for, say, pieces of wood? Can we just say "for sale, a piece of wood" or do we have to specify the type like this: "For sale, an Amboyna Burl"? Or should we be even more specific, for example: "For sale, one Amboyna Burl from Southeast Asia"?
Sorry Jim, couldn't resist....
Brian
Guys, update your subject lines by tomorrow morning with the bike types or your ads are getting deleted...