a unicycle!s bike may look like something out of the circus, but there's a group of people who are devoted to riding it. >> my favorite part about unicycling is that it is different from other sports and it's really fun to learn new tricks. >> probably the adrenaline when you ride and the balance techniques. >> my favorite part about unicycling, if you're riding around town is people notice you and talk about you and you feel special. >> so what is this group that you have? >> this is the new york unicycle club. i founded it along with a friend and my brother back in 2001. >> now david's group has over 300 members, both young and young at heart. >> most historians believe the unicycle was created in the late 1800s, when a contraption called the "penny farthing" boomed in popularity. >> the penny farthing was named after two british coins. its big front wheel looked like a penny and its small back wheel looked like a farthing. but, it wasn't long before riders realized they didn't need the back wh