7 speed cassettes are old gear, and not well supported by spares, anymore.
better to use a freewheel hub then.. you can still source 7 speed freewheels.
Hybrid, a 5 speed IGH, + a chain tensioner, front derailleur, and 2 or 3 chainrings
would be an interesting project.
Last edited by fietsbob; 02-16-12 at 12:11 PM.