Control module mounted on handlebar of bicycle

A control module, which is mounted on a handlebar of a bicycle, comprising:

• a base having a hole, wherein the hole has a first section and a second section;
• a diameter of the second section is bigger than that of the first section;
• and the base is fitted to the handlebar whereby a sidewall encircling the first section touches the handlebar;
• a grip, which is fitted to the handlebar, having a portion received in the second section of the hole of the base;
• at least a control bar pivoted on the base;
• and
• at least a bolt provided on the base, wherein the first section is on the handlebar and the second section is on the grip while the bolt is tightened;
• wherein before the bolt is tightened, the grip is able to rotate relative to the base when the portion of the grip is inserted into the second sections;
• wherein the base has a body and two pressing members;
• the body has the hole and two through holes;
• the through holes are communicated with the hole at the second section, and the through holes are aligned with each other;
• the pressing members are received in the through holes, and the bolt is inserted into the pressing members;
• and the pressing members enter the hole to press the grip while the bolt is tightened;
• each of the pressing members presses the grip in a predetermined direction, and the directions are not parallel, and intersect at a center of the hole.