At the back of the slider as well. It was holding up fine up until my last woods ride, it slipped off, jammed up in the swing arm, and locked my rear tire. Wiped out and had a fantastic time getting the thing off. My sprockets are literally brand new too. I don't think chain brand should have anything to do with tension, but I'll try and see what I can find about the specific brand. It's a D.I.D X ring.