Originally Posted by
rpenmanparker
What do you mean by "going the same speed"? If you are pedaling at 90 rpm and going 18 mph and you increase your cadence to 100 rpm in the same gear, you will go 20 mph. And you will not have to pedal harder, only faster. Of course, your will need more "wind" to accomplish that. If you don't have the cardio capacity, you can't do it
Pedaling at 18 mph at 90 rpm may take 200 watts. Pedaling in that same gear at 100 rpm to go 20 mph is going to take more watts.
You
are producing more power, ie, pedaling harder.