Get someone to examine the wheel and see what's making the noise. It's nothing to do with a speedometer cable.
If you're looking for a Mazda specialist, here's a directory link for you:
No it isn't anything in the wheel, or tire.........it only makes a sound when the car is moving, it is louder during cold weather or maybe I just notice it more then? the air conditioner is louder than the heater I think...........but I plan to have it checked out soon.........when this first started happening the speedometer would sort of shake a bit but it doesn't seem to do it much anymore