It is illegal to perform 'fancy riding' on a bicycle.

The Law Explained

The city of Galesburg enacted an ordinance in the early 1900s to crack down on reckless youth showing off on their penny-farthings and early safety bicycles. 'Fancy riding,' which includes taking both hands off the handlebars or doing tricks on public streets, is strictly prohibited. The city wanted to ensure pedestrians weren't terrorized by Victorian-era stunt riders.