Derby Dust Pinewood Derby Speed Wheels CNC Machined BSA Pinewood Derby Wheels - 1.174" Outer Diameter Reamed inner bore to 0.0980" to remove manufacturing flaws BSA Lettering In Tact, minimal reduction in weight. Wheel Weight will be around 2.46g per wheel Outer diameter turned to remove mold marks, give a consistent tread, retaining bead (crimp) marks. Made for strict wheel rules sets. Will be legal for most packs because of this. Please Check your rules. <span class="a-text-bold">CNC Lathed</span> - Smoothed so that the wheel is perfectly round to the bore, the outer hub step is machined true, and most important the shape of the wheel is minimally altered resulting in a smooth wheel rotation while meeting majority of pack rules. <span class="a-text-bold">Reduced Moment of Inertia</span> -  Because the outside surface of the wheel is smoothed and imperfection is removed from the inside of the wheel to make the wheel lighter will simply cause the wheel to reduces rolling inertiaand allows more weight to be added to the rear of the car where it will do the most good. <span class="a-text-bold">Hand Spun Wheels:  </span>Each wheel is hand spun to sort out ones that have extreme wobble.  If we don&#039;t start with a good wheel, then there is no way to machine it to be a Speed Wheel.  We literally spin tens of thousands of wheels a season. We discard at least 40% of all wheels.