I like 10/16t spaced triples , so a 52-42-26 granny about 1/2 the tooth count of the big one.
Shimano's K cassette is a good 7 speed set.
My Touring rig uses A freewheel (Bullseye 'Tandem' Rear F/W Hub) 13~34t, 6 speeds
Last edited by fietsbob; 03-09-15 at 03:00 PM.