Woz":2vls29d4 said:No levers nor gear mechanisms, one continuous length of chain and no need to mount or dismount to flip the wheel over.
To go in the high gear, you pedal forward (normal) and to go in the low gear you pedal backwardl
I ran this system on a bike many years ago using a cassette hub with two sprockets and a single speed chain tensioning arm. It not only works superbly but it also tests muscles you never knew you had. Only thing is you have to use non-profiled teeth and get the line fairly spot on.
More recently I’ve seen people do this with white Industries two cog single speed freehub sprocket