Despite the additional 20k warranty, the Harmony tires seem to be as
quiet as the Symmetry tires.
We have some blacktop surfaces in our neighborhood that, at slow
speeds, tend to be a good test on road noise and the Harmony line seems
as quiet as the Symnetry line.
Both are virtually silent at highway speed. Incidentally, the Harmony
tires balanced with as little as 1/4 oz. on the total mounted wheel
assembly. One tire took 1 oz. on the inside and 1/4 oz. on the outside
so the tire mold is pretty darn good in manufacturing.
Ron