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b screw Adjustment

We will assume the rear derailleur H & L screws are pulled out. Hence there should be no restriction on the derailleurs movement.

The b screw adjustment is required when either:
#1 In the largest cog there is an issue with chainsuck ( when the chain wraps around the largest cog instead of going directly to the rear derailleur).
#2 One experiences shifting issues in the smallest cogs.
As a general rule of thumb the b screw should be about 6mm away from the largest cog.

Step #1 View the b screw on the back of the rear derailleur ( at the green arrow )

View b screw 

Step #2 If you experience chainsuck issues in the biggest cog turn the b-screw clockwise to pull the rear derailleur back.

Pull derailleur out 

Step #3 If you have problems shifting in the smallest cogs turn the b screw counterclockwise to push the rear derailleur in.

push derailleur in 
 
 
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