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before triples there were wide spaced doubles as used on touring bikes
some times called granny gear or bail out
sun tour also made "alpine gears" that could only fit 5 or 6 cogs but had a fitment range between 14 and 34 tooth
big jumps between each ratio
its a bit archaic but if your looking for a simple build you can take some inspiration from this approach
only problem is that unlike at 21 speed (14 speeds really) you cant just pick and choose the perfect gear for a given cadence
you have to work with what ever ratio you can get
