Matching the number of chainring teeth to the number of links in your chain will mean the same teeth always meet either inner or outer links and this supposedly makes for better wear/smoother running but I've only read this, never experienced it myself.
Matching the number of chainring teeth to the number of links in your chain will mean the same teeth always meet either inner or outer links and this supposedly makes for better wear/smoother running but I've only read this, never experienced it myself.