Some guy named Leonardo drew a roller chain hundreds of years ago in the 15th century, and it wasn’t till about the mid 19th century that it was finally made. I’m hopping my imaginary bicycle won’t take hundreds of years before it becomes a reality.

By the way Leonardo was not an engineer just like me, and he even couldn’t speak or read English but I can, yet he figured it out. The most efficient mechanical method known to mankind of transferring power for the bicycle.