Let's say you used a 28 inch diameter bicycle wheel and measured the height above/below the center hub (the y direction) of a fixed point as you rotate the tire like this:
The table would look like this:
θ 0 45° 90° 135° 180° 225° 270° 315° 360° 405° 450° 495° 540° 585° 630°675° 720°
y 0" 9.9" 14" 9.9" 0" -9.9" -14" -9.9" 0" 9.9" 14" 9.9" 0" -9.9" -14" -9.9" 0"
The formatting of the table is messed up but hopefully you can follow it.
The function would be y = 14sin(θ)