Official BSA Ultralight Pinewood Derby Speed Wheels by DerbyWorx

MAXIMUM VELOCITY!^®

4070
Official BSA
Ultralight Pinewood Derby
Matched Speed Wheels
1.8 Gram Wheels By DerbyWorx

BSA pinewood derby wheels are well designed, but unfortunately the wheels vary considerably from mold to mold. Most of the wheels are not perfectly round and the tread surface is not even.

Our Ultralight Speed Wheels are official BSA wheels which are sorted by mold number, and then precision machined with a CNC (computerized) lathe for maximum performance. To provide you with an awesome set of wheels, we perform the following operations:

The wheels are sorted by mold number, and any defective wheels are discarded.
Wheel bores are reamed and bored perfectly round and smooth.
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, a flat tread surface, and a slight radius on the edges to replicate the look of a stock BSA wheel.
The weight of the wheel is reduced by removing plastic from the underside of the wheel tread, and the backside of the wheel face.

If you would like to order wheels with a particular mold number, Click Here.

Benefits

Round and smooth wheels roll faster than standard wheels.
Matched mold numbers ensures that the bore diameter and other wheel measurements are identical, maximizing performance.
The weight reduction provides a faster start, and improves the balance of the wheel for a smoother ride.

Usage

The Ultralight Matched 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 Hub¹	Trimmed Edge	Reamed Bore	Weight Reduced
4090/4091	Yes	No	No	No	No
4080/4081	Yes	Yes	Yes	Yes	No
4070/4071	Yes	Yes	Yes	Yes	Yes
4060/4061	Yes	Yes	Yes	Yes	Yes

¹The inside wheel hub is coned by default on BSA wheels.

Technical Information for 4070/4071 Wheels

Wheel Diameter: 1.170 ± 0.001 (Raw Wheels: 1.182 to 1.185)

Wheel Bore ID: 0.098 minimum

Wheel Weight: 1.8 grams per wheel (Raw Wheels: 2.7 grams/wheel)

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Pinewood Derby is a registered trademark of Boy Scouts of America