Originally Posted by
Homebrew01
Your bikes would most likely have freewheels, not cassettes. There are about a dozen freewheel designs, so you need the freewheel tool that matches your specific freewheel. Then you need a big wrench, or a bench vise.
The good news is there's really only about 3 common ones.
The bad news is I'm guessing your bikes are going to be one of each.