Abstract: A grip shifter assembly includes a stationary member coaxially sleeving on a bicycle handlebar. The stationary member has a receiving portion formed thereon. A rotary member coaxially rotatably sleeves on the stationary member. The rotary member has an annular portion formed thereon for abutting against the receiving portion. A grip coaxially securingly sleeves on the rotary member. The grip includes a first section, a middle section, and a second section disposed thereon. A plurality of protrusions radially and axially disposed on the first and the middle sections for grasping firmly. The protrusions are arranged in an equal space. The protrusions configure the first and the middle sections into a step-like cylindrical shape. Accordingly, the grip and the rotary member are able to pivotally rotate relative to the stationary member by a user for changing a speed of a bicycle.