Originally Posted by
cderalow
This is assuming that the derailleur limits are adjusted with the cable being slack or not attached and that it's allowed to rest on the stops (the correct way to setup a derailleur)
If the cable is attached to the derailleur and then the limit screws are adjusted, the derailleur won't be resting on the stops.
case in point, OP adjusted low limit and now cable tension has clearly changed. thus, it wasn't resting on the limit stop.
I think I see what you're getting at, but the limit screws should always be set first with no cable attached and then the cable tension should be set AFTER for correct shifting.
On a properly setup system, if the limit screws are messed with but the cable tension is not changed, shifting to the middle ring position will NOT be altered.