This was a pretty cool drawing that I found on the net. I make no claim to its content.
Here is it’s link to its original website.
Pinewood Derby Wheel DXF & CAD Drawing Reference
This page presents technical CAD/DXF drawings of Pinewood Derby wheels — useful for advanced builders, measuring, and engineering validation. You can view cross-sections, hub geometry, and precise dimensions to compare your own wheels or validate mold quality.
CAD / DXF Views
If available, you may download the DXF file to overlay your own scans or CAD models (for educational use only).
Dimension Table (Nominal Values)
| Feature | Nominal Value | Tolerance / Notes |
|---|---|---|
| Outer Diameter (tread) | 1.180″ (30.0 mm) | ± 0.005″ (±0.13 mm) |
| Inner Bore Diameter | 0.098″ (2.50 mm) | ± 0.003″ (±0.08 mm) |
| Hub Thickness (face) | 0.040″ (1.02 mm) | ± 0.003″ |
| Tread Width | 0.055″ (1.40 mm) | ± 0.005″ |
| Edge Radius | 0.020″ (0.50 mm) | ± 0.002″ |
These values are based on sample measurements and may vary by mold number, production batch, or lot. Use them as a reference — not contract tolerances.
Why These Dimensions Matter
- Tread & diameter: Affects contact patch and rolling resistance.
- Bore fit: Determines free spin and impact on axle micro-wobble.
- Hub thickness: Influences axial stability and hub contact with axle head.
- Edge geometry: Ensures consistent contact with guide rails and reduces side drag.
When you compare your wheels to these drawings, you can detect mold shift, warpage, or production variance — empowering you to pick better wheels or know what to avoid.
Helpful Links & Resources
Disclaimer: These CAD drawings and dimensions are published for educational and tuning reference. Derby Dust® does not guarantee perfect fit in every mold or production run. Always test your wheel before full deployment.