Anyway, my bike has just over 20,000 km on the clock, and was running what I think was the original endless chain until last week. The chain was outwardly in good shape. The sprockets showed NO visible wear. So, I decided that each time I rode I would clean two or three links of warm chain by hand, towards moving away from oil-based aerosol lubes. There are 96 links! Finally, the end was in sight. I chose to clean the last half dozen gunky links in one go. Four links from finishing, I FOUND A FROZEN LINK! It couldn't be freed. New DID masterlinked o-ring chain now installed. Lesson learned.
Chain wax is my mantra. If I had to replace chain and sprockets twice as often (no reason to fear same), I'd think it worth the tradeoff!
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