Off-road vehicles for the front and rear drive. Off-road car tires are mainly used on bad roads such as deserts, muddy grounds, loose soil, or other non-road roads. They require tires with high passing performance. Off-road tires often use low pressure, and some use pressure-adjusting tires, depending on road conditions. To adjust the size of the tire pressure. In order to improve the off-road passability, measures such as widening the tire section and rim width, and reducing the rim diameter are generally adopted in order to increase the ground contact area and reduce the ground pressure. In addition to the tire structure bias tire structure, but also with a meridian structure.