I honestly don't think dropping below 7 speeds will gain you any durability and if you are running 1X you'll surely miss the additional intermediate gears. 7 spead Shimano Deore was pretty much bullit proof with the advantage of having an awesome indexing thumb shifter ( switchable to friction) the downside is those systems were meant to be run 2X so the old stuff likely won't work anywayz the rear derailleur probably has a max capacity of 36(?) Now Shimano makes some modern 7/8/9 speed stuff that the sell for lower level bikes, similar to what Rivendell puts on Clems. I am running Altus 9 Speed rear on my Clementine. But did you need freewheel or Cassette?
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