See my Web sites below. My Flickr one has photos of my Dahon Boardwalk- formally a single speed-which I upgraded to a Sturmey-Archer AW three speed hub over 4 years ago-including close-ups of the rear hub. My Geocities one has the Selection part devoted to the upgrades, including the list that I used when I bought the bike and upgraded it right after purchase. Please see the page at: http://www.geocities.com/folder_fanatic/Selection3.html