VIDEO: wheel bearing or rock in wheel?!
 

So i was driving home from school tonight on Ingraham Street here in SD -- those of you who don't know the street, it's just a nice smooth expressway-type street, lots of traffic, no gravel/rocks -- and all of a sudden I hear this TERRRRRRRIBLE metal scraping sound from my rear-left wheel.

I drive around the block a bunch, still doesn't go away.
Well then I thought to park and grab my camera and I took a video of it, if only so that BMW couldn't give me the "we can't replicate the problem, we can't fix it!" excuse should I need to take the car in.

Strangely, after shooting the video, the sound promptly stopped.

Just want to make sure you guys agree it was probably just a rock that got stuck and then dislodged itself.

See (hear!) for yourself!

WATCH/LISTEN TO THE VIDEO CLIP

Yeah - rock stuck between the backing plate and the rotor. A wheel bearing will make itself known at higher speeds than that and is a grumbling/low whine noise. Wheel bearing noise will also not go away - it will simply get consistently worse with mileage.

cool, thank you!!