VIbration on the car
Weights are placed on a wheel is to balance the wheel's rotating assembly (tire and wheel - because tires are not balanced either). A wheel that's out of balance will cause the car to vibrate (the wheel will move up and down like a pogo stick at speed).
You may want to take the car to a tire shop and have all four wheels balanced. Lastly, if when you mounted those used wheels and tires you didn't keep track of what direction the tires originally turned, you may find 'other issues' down the road.







