In the fourth week of the competition, the candidates are challenged to create their own range of electric bikes, before hosting their own launch event to sell their bikes to some of the UK's biggest cycle retailers. As the task unfolds, half of the team head to Nottingham to develop their new bike, while the other half of the team stay in London to choose accessories and create marketing material. At their events, poor pricing strategies and forceful tactics prove problematic, and back in the boardroom, one candidate is sent home.

Lord Sugar challenges the candidates to create and market a new rollercoaster.