With a free wheel you can pedal backwards and all you get is a ratchet sound. With a coaster brake pedaling backwards will stop you, and with a fixed gear pedaling backwards will stop you and could even have you go backwards. That is all fairly easy to follow.
biXe Italia had another idea, that would allow pedaling forward or backwards but where pedaling in either direction would still propel the rider forward. This isn’t so much about the bike but rather the gear system, which can take backward pedaling but still allow the chain and drivetrain to function as if the rider were pedaling normally. What’s the rational to this? According to the company this allows different muscle groups to be worked. Genius or confusing… you decide.
httpv://youtu.be/naeUbvbIx9g