A handlebar end cap for a bicycle comprising:
- a body including a hole having a first inner diameter and at least one end face, the hole also having a fixing groove defined on an inner wall thereof adjacent to the end face, and the fixing groove having a second inner diameter, the body including a slot formed on one side thereof;
- a retaining member formed in a circular ring shape and including a recess defined thereon so that the retaining member is retracted and expanded flexibly by using the recess, and the retaining member including a first outer diameter configured on an outer rim thereof and smaller than the first inner diameter, the first outer diameter of the retaining member having a circular locking loop arranged on a first end thereof, and the locking loop having a second outer diameter greater than the first inner diameter, the retaining member further including a positioning rib defined on a second end thereof, and the positioning rib having a third inner diameter, the retaining member further including a limiting notch greater than the positioning rib, the limiting notch having a fourth inner diameter;
- a cover including a covering face defined on a first end thereof and greater than the end face, and the cover including a first locating trench extending around a second end thereof, the cover further including a defining portion extending outwardly from the first locating trench and greater than the first locating trench, wherein the first locating trench has a third outer diameter, the defining portion has a fourth outer diameter smaller than the fourth inner diameter and greater than the third inner diameter, and the third inner diameter is greater than the third outer diameter;
- wherein the recess of the retaining member expands outwardly so that the third inner diameter is greater than the fourth outer diameter, and the positioning rib fits with the first locating trench via the defining portion, the defining portion fits with the limiting notch, and when the retaining member retracts by pressing the recess, the second outer diameter is smaller than the first inner diameter so that the locking loop fits with the fixing groove through the hole.