1-by gearing? Pah! 4 x 7 is what you need!

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Old touring mechs were able to do 4 rings. A guy in my first club had one on his only bike. Used for everything from time trials (no mudguards, different wheels) to laden unsupported touring over 3 months on the dirt tracks of the Alps/Pyrenees/Rockies/Urals and so on.
 
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It was possible to add a very little ring to crankset with the Mountain Tamer…
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