I don't think I've had to use the "URGENT" plea before, but with DGR tomorrow morning, I need some help.
In checking over the bike before the ride, I checked drive chain slack. It was almost 2", so decided to adjust. Got it to 1-1/4" and tightened things up. Checked again, 1-1/4". Great. Later, after doing some cleaning involving rotating the rear wheel, checked again, tight as hell, but loosens to correct slack at the same point in rotation for every turn of the wheel. All that, and the question is one word: Why?
Richard L.