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@gbj_tester
The reason for the ubiquity of the chain is that even a perfectly aligned shaft drive has higher frictional loss than a chain drive. 1% of transmitted power lost in friction doesn't matter much on a BMW R80, but it's the difference between winning and losing in a bicycle race.
Radial spokes on the rear hub? Good luck with that! Hub flanges look very thin relative to the spoke bend radius too, just add insult to injury.