And once a chain has worn such that it's length is 1% longer than the original length it will start to seriously wear out the chainrings and cassette or sprocket so if you want to prolong the life of those parts of the drivetrain that's when to replace it.
And once a chain has worn such that it's length is 1% longer than the original length it will start to seriously wear out the chainrings and cassette or sprocket so if you want to prolong the life of those parts of the drivetrain that's when to replace it.