My wife has a 2006 Mazda 3 I with 70,000 miles on it. When driving straight, turning, backward or anything, it has a constant click that changes speed with the speed of the wheels. It's not a "grind" like a wheel bearing, it's a click/ ticking sound. It only does it when coasting, as soon as I push the gas and put a load on, it stops completely. I thought maybe it was CV axle so i put a new one on and it didn't fix it or change it at all. It sounds like it is coming from the front driver's side wheel. Being that it is my wife's car, i'm a little concerned. Any ideas?