Charlie Stross@maxwainwright No, derailleur gears go back to 1905-1930; the problem is reliability/metallurgy/machining precision (and a few tweaks like handlebar-mounted shifters) and also tires. I had an MTB-ish bicycle-thing in 1985. It was utter shit when compared to even the cheapest janky supermarket toy MTB you can get today.
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