Denver E-3400RM Manuel De L'utilisateur page 13

Adjusting the rear derailleur's limit screws
The derailleur's range of movement can be adjusted with the H and L
screws.
The L screw allows you to adjust the upper limit (on the side of the largest
sprocket).
When you loosen the L screw, the chain is positioned more towards the
outside of the largest sprocket.
The H screw allows you to adjust the lower limit (on the side of the
smallest sprocket).
When you loosen the H screw, the chain is positioned more towards the
outside of the smallest sprocket.
These actions are performed by a quarter of a turn at a time. At each
adjustment, you should achieve a perfect alignment between the
sprocket, the chain and the pulley of the rear derailleur.
Rear derailleur diagram:
Larger sprocket
Pulley-guide
Adjusting the rear derailleur's cable tension
To adjust a correct sprocket change, use the barrel adjuster on the rear derailleur or the handle. This
barrel adjuster allows you to adjust the derailleur cable tension and to correctly position the
derailleur depending on the chosen speed.
Adjusting the chain
Your bicycle is equipped with an external rear derailleur, the chain is automatically tightened.
H screw
L screw
Pulley-guide
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