"Might be something simple like a rock in the groove of one of your tires. Wouldn't that be great?"
What groove, these are PS2's with almost 5K, they have no grooves..... Thats a good point, I will see if I picked up a nail, or something in the tire that could be making the noise. But is seems like is is more associated with the frame than tire, but still, I will check it out,
ed