1. According to the outer diameter, section width and rim diameter of the tire size, draw the outline with the circular arc command for dimension envelope analysis.

2. The tire parameters are 85% of the section width, the arc radius of the shoulder is 25mm, the horizontal axis is about 50% of the section height, and the rim line height is about 23mm.

3. Merge into a closed circular curve, then find the center of the tire, draw a straight line as the rotation axis, and complete it through three-dimensional rotation.