Any particular speed or side that you can feel it coming through? Is it the whole car or do you feel it through the steering or at the back? How many kms on your car. Could be a number of thngs some of them things that wear out depending on the sort of life the car has had. Again if under warranty, and it should even have a used car warranty, get it into the service dept ASAP. Its present at around 60km and the vibration is coming from the back.