What is the rubber sleeve on Deore XT rear der?
I've got the Deore XT rear derailler on my new Long Haul Trucker and was adjusting it after some initial riding. What's the rubber sleeve on the top part of the tensioner? It seems to be wrapped around the front part of where the chain tensioner cage attaches to the rest of it. I can't imagine it's purpose except to maybe keep dirt from flying directly into that pivot point?