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This reminds me of the nightmare I'm trying to sus for my '82 Bridgestone Eurasia.
Currently got a 50-42, 13-24 setup which is a bit too big for me. Looking at fitting a NOS Campag Rally RD and Suntour New Winner freehub that I came across. Only issue is trying to figure if if I should run it as 7sp, or take apart the freehub and remove one of the sprokets. It appears it has the flexibility to run as 6 or 7sp.
motoko
Ecobeard
Frame width will be your limiting factor for gearing, they are 126mm wide. You can still find good wide range freewheels ie 13-30, or the other option is to fit a shimano Uniglide rear hub with a 7 UG cassette. You could then index a shimano system. Suntour spacing is different again (and there are 3 sub variants) so you'd need the matching shifters and mech for freewheel. The xt mech you have will obviously be friction at the mo, can't see how you could index it other than go UG. I actually have a NOS DX MT63 126mm solid axle hub that you can have for £20 if you wanted to go down that path? I can't see how 8s would work unless you cold set the frame to 130mm and fitted a Hyperglide road hub.