Originally Posted by
Awesomeguy
im getting the run again lol, so how is cable tension related to high and low limit screws?
If I bring the derailleur outward do I have to slacken the cable first ?
Cable tension really isn’t related to the limit screws. The limit screws only set the travel distance. The low limit screw prevents the derailer from moving too far inboard while knocking the chain off the inner chainwheel. The high limit screw limits how far outboard the derailer can move and prevents the chain from falling off the outside.
The cable, on the other hand, is what moves the derailer between those two limits. If the cable is too slack, the derailer can’t move far enough outboard so that the chain jumps up to the largest cog. If it is too tight, it won’t allow the chain to move to the inner chainwheel. The former…i.e. cable too tight… is by far the most common problem.
Understanding the relationship between the cable tension and how the derailer (front or rear) moves is the key to understanding derailers and keeping them working properly. Far too often people think the limit screws are the key. They are not.