Setting the end-stop screws

End-stop screws limit the movement of the front derailleur, so that it cannot drop the chain off the inside or the outside of the chainring.

There are two separate screws, each controlling one end of the derailleur range. The ’low’ adjustment screw prevents the derailleur swinging too far towards the frame, dropping the chain into the gap between chainset and frame. The ’high’ adjustment screw prevents the derailleur from throwing the chain off the outside of the chainring. Before you start adjusting, work out which screw does what. They’ll have H and L marked on them, or a long line next to the H screw (representing the big chainring) and a short line next to the L screw. These indicators will helpfully be printed in black on a black background. Usually, on ’conventional’ front derailleurs (where the band that clamps the derailleur to the frame is higher than the derailleur cage), the H screw is…

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