An article of footwear is disclosed that includes an upper, an outsole, and a midsole. A detector for detecting openingclosing of cover detects whether the cover is in open position or in closed position. The hub assembly may also be modified to include an upper chamfer and an annular groove or notch to reduce the amount of potential surface contact between the centering flange of the disk and the outer diameter of the hub, thereby minimizing contamination caused by contact between the disk clamp and hub. A programmable parameter is created for providing a spacing of TC between each N code bit sequences.