Cool idea.
as this is for generaton purposes - maybe you can find a scrap 10 speed real wheel and fit it on there with a "slick" tire.
take your bike - swap the rear wheel for the "slick" to genorate.
when you go MTbiking - swap them back.
no damage to your Off road wheel
PLus, then you could mount the generator it as best fits on the frame / wheel
Steve
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Steve AKA Doofus
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