cool idea!
heres a thought though. belt drive. take the tire off the rim, and run a belt to the motor. the shape of the rim should keep the belt in place. an old v-belt (or maybe even a serpentine) should work.
i once took the cover off my elliptical machine to see how it worked. resistance was increased by tightening a belt around the "wheel" in the back. now you got me thinking........
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