More expensive chains last longer as the metal plates are made to higher tolerances. This means the pins will take longer to wear out/increase the size of the holes they are sitting in, i.e. the chain will take longer to "stretch".
@MaxC started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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More expensive chains last longer as the metal plates are made to higher tolerances. This means the pins will take longer to wear out/increase the size of the holes they are sitting in, i.e. the chain will take longer to "stretch".