The cause of the front tire leaning out comes from needing new ball bearings. It could also mean you need wheel bearings.
worn out kingpins, or as they are now called ball joints will cause this. so will a bent tie rod
The front wheels on a 1994 Ford Ranger lean inward due to the camber of the steering alignment. Adjustments can be made at a local tire shop.
nail in tire, or rock
Pull to the right.
To wear....
CV Joints? Rocks in the tire tread?
probably not the tire, but the bearings. misalignment can cause vibrations - making all sorts of squeaks.
1999 Mercury front and humming noises can because by several things. Tire noises are the most common cause. A tire that is not wearing properly can cause a humming noise.
They are adjustable three ways to align. That's 2 of the three. If you have uneven tire wear, get alignment done
Tire out of balance is the most common cause.
bearings
Improper inflation or front end out of alignment.