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4.00-12 Tire Size?

1 Answers

AriannaMarie

07/30/25 12:38am

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, expressed in millimeters as the section height and aspect ratio percentage, followed by the tire type code, rim diameter (in inches), load index (permissible load-bearing mass code), and permissible 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 permissible vehicle speed is H grade. Precautions for replacing car tires: When selecting tires, the specifications should be the same as the previous tires 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 new tire and the valve stem have different aging cycles. During the new tire's lifespan, the valve stem may develop issues, which are not easily noticeable. Therefore, it is best to replace the valve stem when changing the tire. Installation direction and inflation: If using the original factory tires, follow the manufacturer's installation requirements. For non-original tires, generally, the side with the production date should face outward. If it is a directional tire, align the arrow on the wheel with the forward direction of the car. When inflating, you can inflate to the maximum pressure allowed by the tire and then reduce it to the standard pressure specified by the manufacturer.

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