Power Meter Question

rstabler11 Posts: 67
edited December 2012 in Road beginners
Hi all,
I was reading about power meters and trying to understand how they work. As far as I can tell, the crankset / pedal meters all measure some degree of flex associated with pushing on them and convert that into power (I still don't really understand how the hub meters work). I know all the pro-riders use power meters, but surely it would be better to use a crankset that was so stiff there wasn't any flex? Or is this just not possible and flex is being measured at the nanometer level?
Basically, does anyone know if power meters are generally not as stiff as other top of the line cranksets (that just focus on stiffness and weight)?


(PS don't worry I'm not going to buy one or anything I'm just curious).