I had to give up riding upright bikes in 2001 due to degenerative disc pain and subsequent fusion surgery. I eventually transitioned to recumbents. Although riding recumbents greatly satisfied my zest for cycling, nothing has ever quite replaced the feeling of hauling ass on a sub-20 lb diamond-frame racing bike. I mean, it's impossible to pretend I'm riding a stage of the Tour or Giro on a recumbent. I still have a steel LeMond Zurich and a titanium Sampson gathering dust in my storage building. These days I'm riding a "stand-up" bike called a Cyclete and loving it!