Modern bicycles are equipped with rather complex gear shifting mechanisms for a more rational distribution of force. Adjustment can be made with a cable on the go, but over time, even the most reliable torso stretches and for normal bike operation, you need to readjust the rear derailleur.
It is necessary
Screwdriver set, hexagon, pliers
Instructions
Step 1
Clean the debris from the derailleur, rollers, tensioning the chain. Lubricate the chain. By the way, sometimes after carrying out this simple procedure, the switch starts working normally again. If not, install the chains on the smallest sprockets, both at the front and rear.
Step 2
Turn the cable tension drum clockwise until it stops. Do the same with the drum on the shifter. Loosen the cable fixing screw with the Allen key. Inspect the cable - if it is loose, replace it, be sure to lubricate the cable. Stand behind the bike and, turning the adjusting screw H, align the tensioner rollers with the smallest sprocket so that they are in a straight line. Raise the wheel and pedal. The chain should run quietly and not jump to other sprockets.
Step 3
Install the cable back. Slide it under the screw with one hand and tighten the fastener with the other. Remove the adjusting screw L and, while turning the pedals, put the shifter into first gear. To do this, the chain must be on the largest rear sprocket and the smallest chainring. At the same time, be careful - if the chain jumps over the sprocket and falls into the spokes, it will be very difficult to remove it from there. Turn screw L until the tensioner rollers are in line with the largest sprocket. If there is a chain tensioner, turn its adjusting screw so that the roller is at a distance of about 5 mm from the sprocket.
Step 4
Then move the chain to the small sprocket and check the tension. The roller must never touch the sprocket.
Check how the adjusted rear derailleur works. To do this, just ride your bike. If shifting is tight, turn the cable tension drum slightly counterclockwise.
