How To Set Rear Derailleur Cable Tension. Hence if the dérailleur does not move into larger cogs it needs more cable tension achieved by turning the barrel adjuster counter clockwise. Adjust the cable tension.
Adjust your barrel adjuster all the way down Loosen the screw that clamps the cable on the derailleur grab the cable with pliers and pull as hard as you can while still pulling re-tighten the clamp. Stop or limit screws - two screws on the derailleur body limit how far the derailleur can swing to the outside H and to the inside L. If this does not occur turn the screw G -.
Cable tension lifts the dérailleur into the larger cogs.
Check that when the shifter is actuated accordingly the rear derailleur positions the chain on the largest sprocket. While rotating them clockwise which screw will move the derailleur arm inward is the H-screw. Due to spring tension the rear dérailleur prefers to stay in the smallest cog - assuming there is no cable tension. To adjust cable tension use the barrel adjuster.
