To dream of a hubcap represents dignity or respect from others about your choices. How “positive” other people see your direction in life being. Nice hubcaps may reflect a lot of admiration or respect you feel about how well you are doing something.
To dream of missing a hubcap may represent feelings of embarrassment or feeling a reduced level of dignity is on display to others. You can’t feel as positive about the direction in life you are taking as you’d like to. A lingering problem may be preventing you from liking your life choices. Feeling your embarrassment is always on display.