Stop! Stop!

A BMX flip flop hub is diffrent to a track flip flop. The point of a bmx flip flop hub is so you may run lhd (left hand drive) not to have two gear ratios.. I am a little out of date with the technolgy but I think most BMX flip flop hubs have casset , clearly because a normal rh thread freewheeel would undo after a while. So run a BMX flip flop hub if you want a diffrent single speed with the ability to set it up lhd but you would also really need a bmx crank set with the ability to run you chainring on the lhs as well or a tandem crankset (or helicoil your cranks) to stop the pedels undoing.