A handlebar grip capable of combining with or without an auxiliary handle is disclosed. Four first tongue plates in an annular arrangement extend from a main grip. There is a gap between two adjacent first tongue plates. Each first tongue plate has a first rib extending therefrom. A cap having second tongue plates corresponding to the first tongue plates is fixed on the outer end of the main grip by interlacing the tongue plates. A hitching ring is sandwiched between the cap and main grip to form an extended portion of the main grip. Each the second tongue plate has a second rib, which connects the first ribs to form an annular rib with the first ribs. The ring has an annular groove to receiving the annular rib and to engage the main grip and cap. The ring may be changed into a horn shape as an auxiliary handle.