As the title states, I am asking you guys for information on how to tell if your chain needs to be replaced. I have heard horror stories about people loosing links and chains busting the case. This is not a favorable condition thus, I need to know if I should replace my chain. I bought the bike as a salvaged bike from a yard. It is apperant that the bike was "rode hard and put up wet" for most of its life. Im talking, to the cord on the center of the rear tire and alomst new condition chicken strips.....not good. I am pretty sure that most people are going to advise me to change the chain. Are the sprockets a neccesary swap at the same time?