Sounds like gravel in the treads. It happened to me when they did that annoying oil/gravel paving method. I had my brother look at the tires with a flashlight as I slowly backed away, and he shouted to stop when he saw the chunk of rock. I'm sure it isn't good for tires to have that in there. Deep treads tend to pick up small chunks of stuff, and I seem to remember you mentioning somehting about new tires not too long ago.
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