A value of 12 gives good results for most cases. However, if the torque at the bottom bracket is all in a small portion of the pedal rotation, a larger value will give better results. See Figure 1 . Plot Position , a plot of the pedaling geometric relationships at a point in the rotation of the pedals, one of the Pedal Model Points, a positive integer less than or equal to Pedal Model Points above. See Figure 1 .
Power is the work required per unit of time to overcome the net forces acting on the rider and bike.
Power Profile Function, power as a function of a short period of time. When a rider commits to a sprint, power increases rapidly, reaches a peak and then trails off. The shape of this power curve is reported to be about the same for most riders. Magnitudes change, but the basic shape stays the same. Data for power curves can be taken in a Wingate Test where a load is suddenly applied to a bicycle ergometer and power is measured over 30 seconds.