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Old 11-26-21, 05:54 PM
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Bikes: Mike Melton custom, 1982 Stumpjumper, Alex Moulton AM, 2010 Dawes Briercliffe, 2017 Dahon Curl i8, 2021 Motobecane Turino 1x12

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Gearing looks like:

which illustrates the compromise of derailleur gearing on small wheel bikes: you have to use tiny cogs or huge chainwheels to get higher gears. Compare this to a Hummingbird or BikeFriday pakit 54x18 fitted with a Sturmey-Archer X-RF4* giving gear inches of 40, 52, 66 and 85.

*which seems like a lot less trouble than designing a proprietary hub, cogset and derailleur.
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