Originally Posted by biker7
Sorry to correct you Terry but Power is proportional to Torque X RPM. So given any increase in torque due to longer cranks at any given cadence or RPM, Power increases proportionately.
George
"at any given cadence" ... there's the rub. Your heart's the limiter of power, not leg strength or torque. If your heart can't supply the oxygen to the muscles, you can't maintain the cadence.
If you're at the limit aerobically, a longer crank won't let you produce any more power. Only more torque, but that's usually a good thing when climbing. More torque means a lower peak quad muscle output, reducing fatigue.