Any ideas where I can get a MTB wheelset for my Montague folder? It is currently set up as a 7 speed so it needs to be compatible with a 7 speed cassette obviously. Can any MTB wheelset be converted to 7 speed? Or does the freewheel need to be 7 specific? I guess there might be chainline issues? Also looking for advice on a cheapish hardside case for my 20 inch full size folder.

Thanks in advance...