On my Edge 530 (fw ver. 9.40), I have displayed the data fields "Gear Ratio" and "Gears".
On my new bike with Di2 Ultregra, the "Gear Ratio" data field does not work properly; it just shows "0.0". See first attached image. The "Gears" data field displays properly.
However, everything works properly on my older bike, also with Di2. Both "Gear Ratio" and "Gears" display properly. See second attached image.

