Originally Posted by
iamLefty
I need to adjust the h-limit screw since there’s chain rub when on the big ring and smallest cog. I can do this without having to do the whole fd tune up, right? L-limit is set ok and the shifting is ok as well. Bike mechanic didn’t set the h-limit properly last time i had it tuned up. I now do the bike tinkering on my own. While i’m confident doing the rd tune up, i find the fd tune up a bit tricky, especially setting the cable tension correct. Cable tension is currently set ok, shifting is fine, so i don’t want to tinker with it unless necessary.
Your problem probably isn’t a limit screw problem. Shift to the big ring and push on the shift lever. If the derailer won’t move outward, you can adjust limit screw outward a little. But if you see derailer movement when you push on the lever, it’s a cable problem. Your cable isn’t tight enough to move the derailer over and hold it there. This is the most likely problem.
Your derailer could also be misaligned. Shift so that the outer plate of the derailer is aligned with the chainwheel. The outer plate should be parallel to the chainring. If it isn’t, you’ll need to loosen the derailer and move the tail so that it is parallel to the ring.