Originally Posted by p2templin

I think there's one other vendor, iBike, who offers derived power. I can't speak to it personally, but think there's enough slop in the sensor readings necessary that it'd be "loose" at best. Garmin might be coming out with power pedals "soon", so you may think there's a marketing angle, but there are other products on the market to sense power too. Interestingly, some of the iBike models will read from a crank-based or wheel-based power sensor, and use it to derive wind resistance and frontal area or something like that.