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I have been spending a lot of time lately looking at BSA wheels (how boring you say). Yes, a bit, and also hard on the eyes. But I am finding some interesting information.

The BSA wheels are made from 16 different molds - numbered from 1 to 18, skipping 6 and 7. Each mold imparts its own characteristics into the wheels it forms. For example, mold 17 creates an extra wide serration; mold 13 creates a flaw on the tread side of the wheel bore; and molds 8 and 11 create undersized wheel bores.

But most importantly, some of the molds produce better wheels from a 'roundness' and symmetrical viewpoint. If given the opportunity I recommend using wheel numbers 2, 3, 5, 12, or 17. These wheels are the most round and most true, so they should produce the best results on the track.

Maximum Velocity
Pinewood Derby Car Plans and Specialty Supplies
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