Hello,
On edge 510 with cadence sensor we have pedal RPM and speed. The GPS also know the wheel length.
So we can compute the instant gear ratio.
That could be an interesting info to correlate with %Slope.
A pareto of the most used gear ratio / % Slope would help to optimize gears.
For exemple you could see that when you climb a 6% cliff you mainly use 34x21.
regards,
Sebastien