Geometry
There are essentially three main geometries in existance in the track spike world, being either pyramid, pin, or christmas tree. Pin is actually a largely inferior design geometry (in terms of improving overall speed performance and track lifetime) and hence it will not be discussed again. The remaining geometries are pyramid and christmas tree, which are shown below.

The 2 main spike geometries produced commercially
There are definite advantages and disadvantages to using each geometry type in the spikes. In terms of grip or traction, the pyramid is superior as the spikes will sink in farther and possibly pierce the surface of the track. This is because the tip of the pyramid design is so much more narrow, concentrating the weight in such a small area, and thus digging into it more. Still, in terms of absolut performance as measure in race times, the christmas tree reigns supreme. The reason is a simple matter of energy return. The christmas tree design has a much flatter end then the pyramid spike, and therefore is less likely to tear at the surface of the track. Since, less bonds are broken, the maximum amount of spring force is retained, meaning the track pushes the runner out of the track harder, returning more energy. The only 2 concerns that arise with this geometry are traction and failure modes. Traction was already discussed above with the pyramid spike, but failure modes is a completely different area to deal with. It all has to deal with the surfaces of the christmas tree geometry being oriented 90 degrees from each other. This shape creates large strain concentrations at the edges, which are sources for crack formation/propogation and thus failure.

Basic dimensions (in inches) of our core piece
What is our solution to this?

Well, traction loss due to the christmas tree spike is not a major concern, because they still sink enough into mondo track surfaces to provide ample grip, even on tight turns and in damp conditions. Our goal is to thus hybridize the 2 geometries so as to get the energy return properties of the christmas tree orientation while increasing the strength to that of the pyramid geometry. Thus, our geometry is a hybrid.

Simple mockup of our hybrid spike geometry.
Our sample is essentially made of 3 distinct parts, the core, the threads, and the coating. The core or bulk part of our spike consists mainly of T300 carbon fibers and thin resin epoxy. This part of our material is the where most of the strength and rigidity of our spike comes from. This is what pushes into the track surface and transfers the resulting force to the shoe. The 2nd part of our spike is the the thread material. The material used it metallic binder or calk, commonly used to fix plumbing pipes. This material acts very metallic like, and is thus ideally suited for our machining purposes. The third section is the protective thin resin epoxy coating, which is applied to the christmas tree surface in order to round off the edges in an attempt to relieve the stress buildup in these areas as well as cap off any surface defects introduced into the spike during the machining process.

General color coded mockup up of the general cross section view of our spikes.