Was everyone expecting to see a road bike?  This is an early 80's mountain bike.  I built it up to bang around town and for my annual trip to Mackinac Island.  I wanted a fixed gear bike for the roads, but I also wanted a mountain bike with lower gears for the single track trails up there.  Sheldon Brown provided the inspiration for the drivetrain setup.  He has a couple of bikes set up similarly.  This bike has a cog bolted where a brake rotor would normally go for its fixed gear.  When I flip the wheel around, I have two cogs on the freehub that line up with the two front chainrings.  The bike is technically a three-speed.  Most of these photos were taken on Mackinac Island (which is in northern Michigan) where cars are not allowed.