As xringer says an aluminium rim would eliminate the problem but also the speed at which the magnets pass the coils would be much higher than at the hub so that would improve the output I think. I wonder if it would be possible to have the magnets on a band which could be strapped around the the tyre, Let the air out of the tyre first, tighten the band then pump air into the tyre. That way the magnets would be on the top rather than the side so the coil(s) could likely stay pretty close to the magnets without the worry of trimming the wheel to run true.
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