You're right -- there are some that do. I have a 6-foot giraffe unicycle with a chain on it, but I never rode that to commute. Most regular unicycles don't hav

You're right -- there are some that do. I have a 6-foot giraffe unicycle with a chain on it, but I never rode that to commute. Most regular unicycles don't have chains or gearing -- they're just direct-drive.