Originally Posted by FormulaMMM
Exactly like your audio, and only could be heard at very low speeds, e.g. approaching a stop. Both times were preceded by driving in a parking lot with some gravel/pebbles.
Formula, did your "cowbell" have a similar springy twang to it? In that video, I am backing up / moving forward *very* slowly (like 1 mph)... it's highly unlikely a pebble would make that much noise with the tire barely rotating... it would probably just roll along the bottom of whatever container it's in.
It really seems like some sort of spring is involved.