Run the chain to 100% worn and change both, yes, the new chain will slip it past 75% worn previously.
Doesn't that knacker the chainring though?
Nah not really, can normally get 3/4 chains on a ring
Just change at 100%, not past 100%
@Thrustvector started
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Run the chain to 100% worn and change both, yes, the new chain will slip it past 75% worn previously.