That's funny: I took apart my dad's exercise bike over Christmas. (Was mulling over this project, and wanted to see how it worked.) Same deal with the friction belt on what amounted to a chain-driven flywheel.
The belt/rim idea works, but then it complicates using the bike as a bike if I have to keep re&re'ing the tire. That's where Doofus' idea of finding another rim would be good.
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