Description
Now, the ultimate wheel for your BSA race!
Our Pro Ultra Lite Pinewood Derby Speed Wheels are official BSA wheels which are sorted by mold number, and then precision machined to tight tolerances with a CNC (computerized) lathe using proprietary fixtures and tooling. The precision of this machining cannot be duplicated on hobby lathes.
To provide you with an awesome set of wheels, we perform the following operations:
- Outer hub faces are coned to minimize contact with the axle head.
- The wheel tread is lathed with True Track to achieve a perfectly round wheel, and a flat tread surface.
- The weight of the wheel is reduced by removing all excess plastic from the underside of the wheel tread and the inside wheel face.
Benefits
- Round and smooth wheels roll faster than standard wheels.
- The weight reduction provides a faster start, and improves the balance of the wheel for a smoother ride.
Usage
The Pro Ultra Lite Speed Wheels are used without any additional preparation. Optionally polish the bore with Bore Polish, then lubricate and race!
Important Note
The lathing operation removes a small amount of tread surface. The serrated edge is intact. The tread reduction is barely visible to the eye, but is measurable with a caliper. If your race restricts the use of lathed wheels, consider using our specialty tools and supplies to prepare a set of raw wheels.
Comparison Chart and Photos of Matched Speed Wheel Types
| Model | Trued Tread | Coned Outer Hub | Trimmed Edge | Weight Reduced |
|---|---|---|---|---|
| 4090/4091 | Yes | No | No | No |
| 4080/4081 | Yes | Yes | Yes | No |
| 4070/4071 | Yes | Yes | Yes | Yes |
| 4060/4061 | Yes | Yes | Yes | Yes |
Technical Information for 4060/4061 Wheels
Wheel Diameter: 1.165 ± 0.005 (Raw Wheels: 1.182 to 1.185)
Wheel Bore ID: 0.098
Wheel Weight: 1.1 grams +/- 0.1 per wheel (Raw Wheels: 2.7 grams/wheel)
