Originally Posted by
royphotog
I was taking a little rest today on my ride and noticed this deformity on my rear tire. When I got home I removed it, checked for any crimping of the tube, didn't find anything, put it back on and the same thing, in the same place on the tire, different placement of the tube in the tire and different placement on the rim. Seams like a soft spot on the tire.
You’ve got broken cords in the material that makes up the casing. The casing is just a fabric that has 40 to 250 threads per inch. I’ve had this happen before and, after cutting it apart, I found a couple of broken threads. The distortion is greater on the 40 to 60 TPI tires than on the high thread count tires.