It seems that songs about bicycles by default sound quite cheerful – possibly because the person writing the song is also compelled to use the sound of the bell that usually comes with the bike. Take for example Queen’s ‘I want to ride my bicycle’ or this ‘Bike Song’ by Mark Ronson.
Listen to the latter at your own risk: I can’t get it out of my head already for a few days now. Not that I mind. By the way: if you are too impatient to watch intros, the actual song starts at 0:45.