Re: Chain tension problem
I measured the radial runout with a dial gauge clamped to a bracket which was clamped onto the bike frame. A thin strip of aluminum cut from a pop can was attached to the tip of the dial gauge to allow the sprocket teeth to pass by the gauge without snagging on the sprocket tips. The dial gauge was also used for the lateral or wobble measurement. With the gauge in place I just turned the rear wheel and watched the variation on the gauge. The wheel bearings had just been cleaned, lubed and adjusted prior to the check to make sure there was no play in the wheel itself. I agree with the suggestion that the problem is a bad chain to sprocket fit in the sprocket teeth. It does look like the only real solution will be to get a new sprocket and/or chain.