Adjusting the end-stop screw on your rear derailleur

The end-stop screws on your derailleur – also known as limit screws – prevent the derailleur from throwing the chain off either end of the cassette. This is a vital task: the end-stop prevents the chain from falling off both the largest sprocket into the gap between the cassette and the wheel, or the smallest sprocket so that it gets stuck between the cassette and the frame.

Either of these contingencies will damage your bike, cutting through the spokes where they join your rear hub or taking chunks out of your frame beside the cassette. The chain will get firmly wedged too, so the chances of you falling off and hurting yourself are quite high. Only the heads of the end-stops screws are visible, the shafts of the screws are hidden inside the body of the derailleur. The derailleur is designed so that, at either end of it, the tips of the end-stop screws come into contact with tabs moulded into the pivoting part of the derailleur. Screwing the end-stop screws further into the body of the derailleur means that the ends of the screws hit the tabs sooner, limiting the movement of the derailleur and preventing…

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