Bicycle gear shift control system capable of avoiding frequent gear shifting

A bicycle gear shift control system capable of avoiding frequent gear shifting, the system being installed on a bicycle having a derailleur, the system being adapted to control a gear shifting action of the derailleur, the system comprising:

• a power module;
• a microcomputer electrically connected to the power module and adapted to switch between an automatic gear shifting mode and a manual gear shifting mode;
• a gear shifting driver electrically connected to the microcomputer, substantially connected to the derailleur, and instructed by the microcomputer to drive the derailleur to perform gear shift control;
• and
• a manual shifting controller electrically connected to the microcomputer;
• characterized in that:
• the microcomputer has an automatic gear shifting logic whereby the microcomputer determines a timing of automatic gear shifting and performs gear shifting;
• the microcomputer further has a gear shifting delay logic, wherein the gear shifting delay logic involves delaying for a fifth time period from commencement of gear shifting when a cyclist executes an instruction of manual gear shifting with the manual shifting controller in the automatic gear shifting mode, wherein, during the fifth time period, the microcomputer rules out all other determinations of automatic gear shifting and merely accepts an instruction of manual gear shifting performed by the cyclist with the manual shifting controller, wherein the automatic gear shifting mode resumes as soon as the fifth time period ends.