The second place would be the inside of the driver door and the third place would be the owners manual. Before this question can be answered, we must place your vehicle into a catergory. All other vehcile belong in a CAR group. Even a full size staion wagon. In the car category we have different ratings.
Speed rating is an important rating.
This rating speaks of the performance of the tire. The Traction and Temperture ratings will be A,B, or C, with A being the best. Your will contain the size measurements. 175 is the width of the tire. 70 is a aspect ration of the first number and 13 is your rim size.