Hi IFLY_INDIGO,
why airbus could not provide any chart/table that could state the possible climb gradient in various conditions, all engine/single engine?
Do you mean like the charts contained in:
Performance, Take Off, Take Off Data, 50 Net Take Off Path, Close and Remote obstacle clearance for all the take off flap settings, showing the climb gradient V the take off weight?
Do you actually read your manuals?