Things You'll Need
Instructions
Find a set of playing cards that you don't mind ruining. Get some tape or ordinary clothes pins.
Tape the card to the back frame of the bike, ensuring that enough of the card sticks out to slap on the spokes as they go by. Alternatively, clothespin the card to the spokes of the bike so that it slaps the frame as it goes by.
Ride the bike and enjoy. The faster you go, the louder it sounds. Eventually the cards will wear out and need to be replaced. Experiment with more cards to get an even louder sound.