As the title says - just hit 5k miles and wondering when I should plan on replacing the chain and sprockets? I clean the chain (using Permatex chain lube) and check/adjust the slack every 500 miles. It looks clean, no rust etc.
A well maintained O-Ring chain will last a long, long time. How long depends on how and where you ride, but easily 15K miles. I make sure I clean the chain first, then warm it up with a short ride and apply chain wax. I stay away from oils and sticky lubes.Correct maintenance is the key to long life, as you surely are aware. With an O-ring chain, it is essential to maintain the integrity of the O-rings: that is the big issue. Do not apply lubrication to the chain rungs: that simply accelerates wear, especially to the countershaft sprocket