Originally Posted by
tatfiend
I have not heard of such a problem before. Could it possibly be a tire related issue such as tire imbalance or out of round? Rare on a bike tire I know but it may be a possibility. I would try a different tire & tube just to see.
It's not the tire. (OK... it might be, but it's the same one as I've been running all summer.) If it were, it feels like the tire has gone from a smooth tread to a fine-grain knobby. It's a fairly high-frequency vibration. Anybody else? Anybody? Bueller? Bueller?