In the bad old days before oring type chains were used, many smaller bikes used enclosed chains. There was an aftermarket company in the seventies that offered an enclosure conversion for a lot of mid and larger bikes. It was fully enclosed and sealed and ran oil in a reservoir; chain life of 30-40k could be expected with 6-8K between adjustments, but it was complicated to put on and very heavy....and it looked "geeky"...so it didn't sell....
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