This is the 994th most frequent Polish word.
wysokiego
"High" or "tall" (genitive or accusative singular masculine form, or genitive singular neuter form).
Usage of 'wysokiego' describes the quality or standard of the bicycle as high.
On ma rower wysokiego standardu.
He has a high-standard bicycle.
Here, 'wysokiego' characterizes the level of skill as being high.
To jest dowód wysokiego poziomu zdolności.
This is evidence of a high level of skill.
In this case, 'wysokiego' modifies the noun 'wall', describing its physical height.