tire 3d model

System Directive: Act as an expert parametric 3D CAD modeling software. Your task is to generate a highly detailed, solid 3D STEP file of a Non-Pneumatic Tire (NPT). Do NOT generate a standard solid pneumatic tire. The radial space between the inner hub and the outer tread MUST be completely hollow, filled ONLY by a repeating structural spoke matrix. Global Bounding Dimensions: Total Outer Diameter (OD): 668.7 mm Inner Bore Diameter (Hub ID): 457.2 mm Total Axial Width: 235 mm Step 1: The Inner Hub Ring Create a solid cylindrical ring. Inner Diameter: 457.2 mm. Outer Diameter: 477.2 mm (Radial thickness of 10 mm). Axial Extrusion Length: 235 mm. Step 2: The Outer Tread Ring Create a solid cylindrical ring concentric with the Inner Hub. Outer Diameter: 668.7 mm. Inner Diameter: 648.7 mm (Radial thickness of 10 mm). Axial Extrusion Length: 235 mm. Note: Do not apply complex tread patterns on the outside yet; keep it a smooth cylinder to ensure successful generation of the internal structure. Ste