Assuming you would like to know the stock tire size for your vehicle, there are a few ways to go about finding this information. The easiest way would be to look in your owner’s manual. Every vehicle has an owner’s manual that contains important information about the car, including the stock tire size. Another way to find out your stock tire size is by looking at the door placard on your driver’s side door. This placard should have all of your car’s pertinent information, including the stock tire size. Finally, you can always contact your dealership and they will be able to tell you what the stock tire size is for your specific vehicle.