Tom Kunich wrote:

the most common power meters are built-in to cranks.
Aside from the fact that most only read directly from half a crank,

As long as the power meter isn't only in a single crank _arm_, it
measure the total outout (check how the power goes to the rear
wheel...)

PROS do not produce this level of power for 10K - they can do it for 100K.

Please tell us which "PROS" can generate 400W for 100K. (BTW: are
you talking about km (kilo meters, metric) or something else when
you write "K"?) You might want to look at the power output for the
hour record -- obviously that kind of power can NOT be achieved for
two hours.