Genuinely, they don't. They get a bit longer when they begin to wear out but this is to do with the pins and bushes wearing down. So it may get a bit longer but as it wears out, not as it settles in from being new. An over tight chain will very quickly wear through your nice chainring and cog though.
Genuinely, they don't. They get a bit longer when they begin to wear out but this is to do with the pins and bushes wearing down. So it may get a bit longer but as it wears out, not as it settles in from being new. An over tight chain will very quickly wear through your nice chainring and cog though.