A vibration that only shows up once you’re at higher speed usually means a wheel is out of balance. A thump at any speed points to a tire going bad. If you feel it in the steering wheel, it’s probably a front wheel; if you feel it but not in your hands, it’s probably a rear wheel. Common causes: tread wearing down unevenly, a wheel weight knocked off by a pothole, or a clump of mud stuck inside the rim. Traveling Tire Service balances wheels right in your driveway anywhere in Northwest New Jersey. Shop tires and book your install at travelingtireservice.com.