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What cassette does it have on the back wheel? Probably a 7spd screw on. The cheapest way to get lower gears is typically to use a massive rear cassette. But you'd likely be limited by your 7s (possibly screw on) hub and current rear derailler capacity.
I'm well out of the loop on MTB stuff but I wonder if there isn't a group that will play nicely with cantis? Maybe have a look at what the CX racers use (before they all went to disc brakes).
hippy-
Didn't see this reply, sorry. I'm not averse to getting a new wheelset and going more modern. Bit sentimental about the frame but I think the parts have had their day.
Basically I was wondering if I could just get say r7000 105 or new tiagra and get the same range I've got now. I'll check out cx guys though!
nauls
I'm well out the bike loop now but I'm looking to sort my galaxy out so I can do some light tours again. Can you get a similar range with a modern 2x group compared to the 80s 3x7 it currently has? Would that be mtb or road?
I guess the problem is that it has canti brakes so sti's won't have the right cable pull? Please help, thanks