Plummy has built himself a fantastic bicycle and starts to cycle on the racecourse, he has made as well. Suddenly Plif and Plops show up and feel keen to have a go at cycling. However, they aren't clever enough to build a bike on their own. They try to get their hands onto Plummy´s bike with all kind of tricks: as a fake bush, a puddle or a pot hole they try to bring him down, until his bike breaks apart. Luckily Plummy can restrain his anger and builds a three-seater bike for all of them!