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What is the size of a 400-12 tire?

1 Answers

DeJameson

07/30/25 9:46am

400 represents the tire section width of 400mm, and the following 12 indicates the rim diameter of 12 inches. Tire size specification example (taking 195/55R15 as an example): The international standard tire code represents the section height and aspect ratio percentage in millimeters, followed by the tire type code, rim diameter (inches), load index (allowable load mass code), and allowable vehicle speed code. For example, 175/70R1477H, 175 represents the tire width of 175MM, 70 indicates the tire section aspect ratio is 70%, meaning the section height is 70% of the width, the rim diameter is 14 inches, the load index is 77, and the allowable vehicle speed is grade H. Notes for replacing car tires: When selecting tires, the specifications of the tires should be the same as the previous ones and must match the other tire on the same axle, such as speed rating, load index, tread pattern, brand, size, etc., to ensure safe driving. The valve stem should also be replaced because after changing the tire, the aging cycle of the new tire and the valve stem may differ. During the new tire's cycle, the valve stem might develop issues, which are not easily noticeable, so it's best to replace the valve stem when changing the tire. Installation direction and inflation: If using the original equipment tire, follow the manufacturer's installation requirements. For non-original tires, the side with the production date usually faces outward. If it's a directional tire, align the arrow on the wheel with the car's forward direction during installation. During inflation, you can fill the tire to the maximum allowable pressure and then reduce it to the manufacturer's specified standard pressure.

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