Crank set having a pedal pivoted to a crank arm through an adapter

A crank set comprising:

• a crank arm extending in a longitudinal direction, and having two opposite sides and a pedal-connecting end that is formed with an internally threaded hole extending in a transverse direction relative to said longitudinal direction;
• a tubular adapter extending in said transverse direction, and having an externally threaded portion inserted threadedly into said internally threaded hole in said pedal-connecting end of said crank arm, and an enlarged head extending axially from said externally threaded portion, said adapter confining a shaft hole extending through said externally threaded portion and said enlarged head;
• a pedal unit disposed at one of said opposite sides of said crank arm, and including a pedal shaft and a pedal body pivoted to said pedal shaft so as to permit rotation of said pedal body about said pedal shaft, said pedal shaft having a crank-connecting end that projects outwardly from said pedal body into said shaft hole in said adapter and that is formed with an internally threaded hole;
• and
• a headed bolt disposed at the other said opposite sides of said crank arm, extending into said shaft hole in said tubular adapter, and threadedly engaging said internally threaded hole in said crank-connecting end of said pedal shaft so as to prevent disengagement of said pedal unit from said crank arm.