Official BSA Pro-Stock Pinewood Derby Speed Wheels and Axles by DerbyWorx

MAXIMUM VELOCITY!^®

4080
Official BSA
Pro-Stock Pinewood Derby Matched Speed Wheels
2.5 Gram Wheels By DerbyWorx
&
4094
BSA Speed Axles

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.

These Pro-Stock Pinewood Derby 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.

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.

Usage

These Pro-Stock Matched Speed Wheels can be used without any additional preparation. Optionally polish the wheel bore, 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 4080/4081 Wheels

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

Wheel Bore ID: 0.098 minimum

Wheel Weight: 2.5 grams per wheel (Raw Wheels: 2.7 grams/wheel)

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