If your vehicle is vibrating while you're driving, it's a good indication that your tires need to be balanced. You might also notice that your steering wheel is shaking or that your vehicle is pulling to one side.
If you suspect your tires need to be balanced, the best thing to do is take it to a professional mechanic and have them check it out. They'll be able to tell you for sure if your tires are unbalanced and can fix the problem quickly and easily.