If you think that there is nothing wrong with the tyres, then take your ride to some garage which has lift in it. Park it on the lift, and jack it up.
Start the car and let it run at very low speeds. See, if the technical expert observes something unusual.
Like tyres rubbing / touching against anything? any vibrations, strange and abnormal noises, etc.?
During this, ensure that nothing is near the tyres, engine, etc., i.e. any moving part, else if, it can prove a very very dangerous safety hazard.
I may be wrong, and this may not be the exact solution, but still, this is all what is coming in my mind right now.