Tire makers test extensively for resonant frequency vibrations from tires due to new tread patterns, manufacturing deviations and material deviations. All tires are not alike. Not even two of the same make and model. Two different people could have built the tires from different plants using different but similar materials. So what does this mean to us? All the best true tires go to OEM manufacturers because they want their cars to operate smoothly when new. All the rest are sold to the general public. All tires will resonate at different speeds and with different vehicles. At high speeds, higher than the tire can handle, the tire will literally shake itself apart. You should see the videos of high speed tire tests as the tires weave and wobble on the test drums. Makes you want to slow down real quick! You get what you pay for in tires. Best quality in my opinion is Michelin.