I was behind a couple of riders today going down the trail, about fifty feet behind them I could hear the pain of an unlubed chain grinding without mercy to an agonizing death. Why o why do people kill chains in this horrible manner, or at least, why did I have to listen to this sick sound, so I took another route. The unlubed chain sound is kinda like fingernails on a chalkboard. I guess in this case the sqeaky wheel did not get the grease (oil). DOH.