Adjust gear shift

The rear derailleur has the task of holding the chain on the sprocket. Operating the shift lever at the front of the handlebar controls the shift cable. The shift cable pulls the rear derailleur up and down, causing the chain to move up and down. 
In the first step, it is important to adjust the shift cable via the tension so that the chain moves up and down. Only in the next step is the limit adjusted so that the chain does not jump out.

How do I adjust the rear derailleur?

To adjust the rear derailleur, note the following: 

1. The correct tension, namely 
   - coarse adjustment of the tension via the rear screw 

   - fine adjustment of the tension via the screw on the front shift lever

2. Limit end stops upwards and downwards so that the chain does not jump over the sprocket
3. Distance from the rear derailleur to the cassette 

 There are 4 adjustment screws for this. Best you look at the following video ... 

1. Adjust tensile stress 

Proceed as follows: 

1. First, remove the basic tension completely from the shift cable.
   To do this, shift the gearshift lever down at the front so that there is no more cable. That is, turn the dial completely to the right so that the tension is gone (check at the back of the shift cable - should be loose). 
2. Now the rear derailleur does hard when shifting and the chain can not get up, the tension is low. 
3. To fine-tune the tension, raise the front shift lever. Turn the crank and turn the adjusting wheel at the front gradually to the left. While doing this, check the chain to see if it moves from the small sprocket to the next sprocket. 
   If the chain jumps, there is too much tension on it, so reduce the tension by turning the adjusting wheel to the right. 

TIP: If the chain is closer to you, turn the front wheel towards you (heavier gear). If the chain is away from you, turn the wheel away from you (lighter gear). 

2. Adjust the limit stops 

To adjust the limit there are 2 small screws marked L (low) and H (high).
First tighten both screws and test if the chain does not jump further up or down (stops) at the outermost sprocket. Shifting should not be possible. 

• Limit the lower (inner) stop: turn in the screw - marked with L - step by step. 
• Limit upper stop: screw - marked with H - turn in to set the stop further upwards, turn out to set the stop further downwards. 

3. Distance from rear derailleur to cassette 

For a perfect adjustment, the rear screw must either be screwed in to the right - the distance of the rear derailleur to the cassette is increased - or the screw must be screwed out to the left - the distance of the rear derailleur to the cassette is decreased. 
Sometimes on the rear derailleur cage there is a mark (auxiliary line) with which the teeth of the largest sprocket must be aligned with the cassette. In any case, in the end, all gears must be shifted through and tried.