Hi, I just replaced all 4 of my tires, got an alignment done as well. I've been noticing a rumbling noise. When driving straight, the noise is very noticeable at 30mph and above. The noise gets louder as the speed gets faster. When driving a slight left (not 90 degrees left turn) it's very loud. But when driving a slight right it does not do the same thing. I don't know what the problem is. I don't think it's the tires..could it? Thanks in advance for your replies.

 

Check the plastic splash guard in front of the tire. Mine comes loose from time to time.