Has anyone noticed a correlation between different tires alone and steering wheel vibrations?
Yes, my customers have different symptoms dependent upon which set they use, and they are balanced properly.
The 4-5 different Ford part #'s are based on wheel/tire size-combo from the factory.....so it surely has something to do with it.
EG: the EPAS rack on a Mustang with 18" wheels has a different part number than a Mustang with 19" wheels.