most likely you're picking up chunks of rubber that come off other people's tires (usually slicks). kinda unusual in a/x, but at track events i pick up so many of these 'cling-ons' that i have to cut them off with a razor blade afterwards. they even throw tires out of balance a bit and cause high speed vibration. assuming, of course, that what you are looking at is the same thing (hard to say without a picture). quite likely, though.
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