You can rsync over a custom port for cases when you have custom ssh tunnels setup using rsync’s -e flag. The -e flag tells rsync to use a specific shell, in this case it’s still ssh, but with the addition of the -p flag.
Setup a custom tunnel
ssh -N -L 2222:10.0.0.2:22 user@remote-machine
Use rsync over the custom tunnel
rsync -avz -e 'ssh -p 2222' localhost:/files /myfiles