Hi. Today as I was driving a short distance (3kms) at low speed (60km/h max) my back left tyre started making a small noise with every rotation. Similar to the sound you would hear if your bike had a hole in the inner tube while you were riding it. I had not hit any potholes, rocks or other obstructions during the drive or prior to today. When I returned home at the end of the drive, I checked all the tyres and none seemed to have anything wrong with them. They weren't flat, the tread was fine and none had a burnt rubber smell to them. The back left tyre, the one I suspected was making the noise, had a miniscule rock, about a centimetre big, in a tyre groove. I removed the rock. Is it possible that this was what was causing the noise? And if not, what is and what can I do about it, short of replacing the tyre? I have not driven the car since so do not know if the noise has stopped