I have been collecting bicycles for 15 plus years. For a lot of the early years I picked and chose only old single speed , coaster brake bikes or three speeds. I passed up a lot of derailleur shift style bikes.Now I have a few ten speed bikes and I enjoy messing with them and understand how they work and how to work on them. It makes me wonder what all I passed on that I would be glad to have now. Oh well , you can't go back.