Originally Posted by oilman_15106
Maybe someone will be able to shed some light on this issue. Shimano Ultegra 9 speed triple, front der is braze on. The problem is that when down shifting from the big to middle ring it often shifts all the way to the small ring. The logical thinking is the shifter cable is too tight. But if I make it any looser than it is then when the shift is made up to the big ring the der. housing rubbs the chain. 250 miles total on the group.
I have always set these things up according to the Parks book. Any other ideas than just keep messing with it until the sweet spot is found? Thanks in advance.
Odd as it may sound, sometimes this sort of behaviour can be caused by sticky cables. If you didn't do so on install, remove the cable, lube it and re-install.
Another possibility is that you're not getting all your "upclicks" in as you shift up due to a too-tight upper limit screw. That is, you may be able to get the chain on to the big ring but the shifter "thinks" it's on the middle ring. Drop the derailleur down to the small ring and un-clamp the cable from the derailleur. Then put a little tension on the cable with one hand and use the other hand on the shifter to shift "up", counting clicks as you go. You should count the same number of clicks when the cable is attached to the derailleur.