Its not typical of tire issues. Its not a bump or thump its a buzz for like nearly a second at 28 mph. Its not stretched enough to hit the top of the gear but not landing in the bottom of the chain seats as it should. And its only one section of the chain about 6 or 8 inches long. I think the rotor problem and the way the pipes are mounted are amplifying the problem like a resonant wave at 28 mph.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe