Instructions
Play "CycloManiacs" Planetoid level 1 (Craters), and do 15 seconds of rear wheelies to unlock cyclist Letter F, who has a penny-farthing bicycle.
Choose cyclist Letter F for Outlands level 3 (Zigzag).
Do a front wheelie immediately when the race starts. Maintain it even if you fall behind until you reach boost level 5.
Pass the other racers to win the race and unlock the Bowler Brothers. The level 5 boost will help, but go for speed rather than stunts and avoid crashes.