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@gbj_tester
So just the common or garden failure we expect from flush riveted dérailleur chains. They all do that, it's one of the penalties you pay for light, cheap changeable gears. You could switch to YBN or KMC or Campag or Shimano and go through life without ever breaking another one, and you might mistakenly think changing chain brand had any effect on the matter, but really they're all about as good as one another. The only chain I've heard of in decades of cycling which actually had a systematic fault was the Shimano CN-6700, and that suffered from stress corrosion cracking which is a completely different mode and mechanism.