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BSA Ultralight H-Tread Matched Speed Wheels




BSA 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 H-Tread 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. H-Tread Speed Wheels are made from mold number 1, 9, and 16.



• The wheel tread is lightly lathed to achieve a perfectly round wheel, and a flat tread surface.



• The tread is undercut to reduce the track contact patch and to reduce weight. Both of these increase performance.



• The weight of the wheel is further reduced by removing plastic from the underside of the wheel tread.



• The inside wheel hub is lightly beveled to reduce contact with the car body.

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 molding mark on the tread is removed, eliminating the 'bump'.



• The weight reduction provides a faster start and improves the balance of the wheel for a smoother ride (the inside edge of the wheel is intact).



• The small contact patch minimizes contact with track flaws and may reduce frictional forces.



• The beveled hub reduces the braking that occurs when the wheel hub contacts the car body.

Usage

The Ultralight H-Tread Speed Wheels can be used without any additional preparation. However, the following steps can be performed for additional speed:

• Polish inside edge - Place a wheel mandrel in a drill, mount a wheel on a wheel mandrel, start the drill, and lightly polish the inside edge of the wheel (opposite the spokes) with a polishing compound or very fine wet sandpaper (minimum 600 grit). Do not sand or polish the tread surface.



• Polish the Bore - Polish the wheel bore with graphite or bore polish. Click here for more information.

Important Note

The lathing operation removes a small amount of tread surface. The serrated edge is intact (see Figure 1). The tread reduction is barely visible to the eye, but is measurable with a caliper. If your race restricts the use of lathed wheels or H-tread wheels, consider using our specialty tools and supplies to prepare a set of raw wheels.


Figure 1
Serrated Edge Intact


Technical Information

Wheel Diameter: 1.170 ± 0.001   (Raw Wheels: 1.184 to 1.199)

Wheel Bore ID: 0.094 minimum

Wheel Weight:   2.3 grams per wheel   (Raw Wheels:   3.6 grams/wheel

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