0Vyger 6 years ago Another form of sound card ----- You take regular playing cards and attach them to the wheel support of your bike so they reach into the spokes. We used to use clothes pins to hold them, wrap the end of the card around and clip it. Then as you ride the cards slap against the spokes and it makes a sound almost like it is motorized. You can usually get at least one on each side. Don't use good cards, they get destroyed by doing this.