This is the sickest attempt with a bike ever. Take a look at this Red Bull funded record attempt which included balancing with the bike on a slackline more that 300 ft in the air. Everything was rigged up in the French Alps, where Kenny Belaey attempted and succeeded in balancing on the slackline with his bike. He had one year of preparation for the event and clearly he made it work. This is one of the bravest bike attempts of all time.
Wait. What!? Check out the below video for more crazyness!