Originally Posted by

**jshort2010**
Suppose V_a is the cyclists ground speed with respect to the wind. If we have a tail wind of 8 m/s (so 18 mph approx) and your going with the wind, then V_a = 0 if you are also moving 8m/s.

Thus P = g * m * 8 * (K_1 + s).

If we are going on level terrain than s = 1.

Assume the bike is 8 kg (so a pretty light one) and the rider 75 kg;

K_1 = 0.0053 approx, so K_1 + s = 1 approximately.

Thus P = g * m * 8 = g * 664.

g = 9.8 m / s^2

Thus P = 6500 watts approx.

This sounds wrong. The world record is around 2300 watts, and in the above case the 75 kg rider is going with the wind on a light 8 kg bike at only 8 m / s (18 mph).

This doesn't look right