The function of the bicycle transmission system is to change the speed of the bicycle by changing the cooperation of the chain and the gear discs of different front and rear sizes. The larger the front sprocket and the smaller the rear sprocket, the harder it is to pedal. The smaller the front sprocket and the larger the rear sprocket, the easier it is to pedal. According to the abilities of different people, the speed of the bicycle can be adjusted by adjusting the bicycle shift line.

• First adjust the rear derailleur:

First turn the handlebar to the position with the loosest gear shift cable. The digital display is adjusted to the gear with the largest number, such as 6 to 6 and 7 to 7, and then turn the pedal to let the rear derailleur change the chain to the smallest chainring.

• Tighten and lock the shifter cable for mountain bike:

Let the derailleur stop at the smallest chainring and not fall off the small chainring. Then find the bottom stop screw on the derailleur and adjust this screw so that the screw just hits the bottom stop iron block of the derailleur.

Then turn the pedal while twisting the shift knob so that the rear derailleur will change the chain to the largest chainring and stop at a position where it will not fall from the chainring.

• After adjusting the rear derailleur, start to adjust the front derailleur:

Adjust the bicycle shift cable so that the chain changes to the middle chainring. This is to prevent the front derailleur from rubbing against the chain due to changes in the rear derailleur, and then tighten the wiring and lock it.

• Adjust the top stop:

Change the front derailleur to the largest chainring and adjust the top stop screw so that the chain is in the middle position of the front derailleur. When adjusting, make sure that the rear derailleur is in the middle position of the chainring.

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