OK, we've had various discussions about chain life, what (chain   ) lubes people are using, etc....  but it occurred to me that I'm also running on the original rear DR on my SXP, what has those little cogged rollers spinning around -- granted, there's not a whole lotta tension/friction there, but when does one consider replacing THAT part of the bike???

Paul, I replace jockey wheels when shifting starts getting sketchy and changing everything else doesn't help, usually there are visible signs of being worn out (teeth almost imperceptible, missing teeth, chunks gone from side of pulley), or the wheel gets very sloppy on the derailler.