1x12 Speed Bicycle Trigger Shifter SL-M700-R12

What role do the limit screws play in the 1x12 Speed Bicycle Trigger Shifter and how to adjust them correctly?

The limit screws play a vital role in the 1x12 Speed Bicycle Trigger Shifter. Their main function is to limit the forward and backward movement range of the derailleur, ensure that the chain runs on the correct gear, and avoid the chain from falling off or the derailleur going beyond the predetermined gear range. .
Specifically, the limit screw on the front derailleur controls the chain's position on the largest and smallest front cog, while the limit screw on the rear derailleur controls the chain's position on the largest and smallest rear sprocket. By adjusting these limit screws, the position of the chain on a specific gear can be precisely set, ensuring accurate and smooth shifting.
The correct way to adjust the limit screw is as follows:
First, make sure the bike is in a steady state and the transmission is in neutral. Then, locate the set screws on the front and rear derailleurs. These screws are usually located on the side or top of the transmission and can be adjusted with a special screwdriver or wrench.
Next, adjust the front derailleur stop screw. First adjust the high limit screw, place the chain on the smallest front gear, and then rotate the high limit screw until there is an appropriate gap between the chain and the inner guide plate to avoid the chain from rubbing against the guide plate. Then adjust the low limit screw, place the chain on the largest front gear, and rotate the low limit screw to ensure that the chain does not fall off to the outside.
Then, adjust the rear derailleur limit screw. Also adjust the high limit screw first, place the chain on the smallest rear flywheel, and rotate the high limit screw to keep the chain at an appropriate distance from the guide wheel of the rear derailleur. Then adjust the low limit screw, place the chain on the largest rear flywheel, and rotate the low limit screw to ensure that the chain does not fall off to the outside of the flywheel.
During the adjustment process, be careful not to over-tighten or loosen the limit screw to avoid damaging the transmission or causing inaccurate adjustment. After each small adjustment, perform a shift test to check that the chain can run smoothly through each gear without rubbing or falling off.
Finally, after completing the adjustment, make sure all screws are tightened to prevent loosening during riding. At the same time, regularly check the condition of the limit screws to ensure that they are not loose or damaged to maintain the normal operation of the transmission.
Please note that different brands and models of 1x12 Speed Bicycle Trigger Shifter may be structurally different, so before making adjustments, it is best to refer to the relevant user manual or repair guide for specific adjustment methods and requirements. If you are not sure how to adjust the limit screw correctly, it is recommended to seek help from a professional bicycle mechanic.