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Seems cool. On the motorcycle side, I enjoy having a bike without a chain. Instead my BMW has a shaft that runs from the transmission to the rear wheel. Maintenance over 75K has been occasionally lubing the rear splines. There's been some attempts at a shaft driven bicycle but the downsides seem to come from the tighter tolerance, harder disassembly and overall heavier frame construction required. still cool from a longevity POV.

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Transmission via shafts is also less efficient. It doesn't matter much on a motor bike where there's plenty of power. But on a human powered bike, every watt counts. See for example https://www.cyclingabout.com/chainless-shaft-drive-bicycles/ for more information.

I went down the same path owning a BMW shaft drive motorcycle, doing my own maintenance. I decided i had enough of re-tensioning the chain on my bicycle (Living in Amsterdam) and got a second hand Brik shaft bicycle. Indeed maintenance is harder, but i have far less maintenance. So instead of ~twice a year giving my chain bike some love, i now bring the Brik to the shop once every 2-3 years.

I still ride a normal chain bike regularly, and I can't say i find the Brik heavier to ride. It all seems negligible compared to the watts wasted by the sitting position of a city bike.

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