kwackers wrote:I'd put money on it the pressure drops as your cadence increases.
We use higher cadence to increase power, since power is a function of the pressure (torque) and RPM then increasing RPM increases power, but there's a drop in pressure - probably non-linear and becoming much more pronounced at the top end of your cadence. At some point there'll be no increase in power because the pressure drops off faster than the rpm increases - theoretically that cut off point is your optimum power delivery.
I'll go along with that and add that OC differs from person to person.
But MickF's 30rpm cadence will have to increase as the gradient does to ease pressure.30rpm cannot be maintained(seated)on say a 20% gradient.