Originally Posted by
mzeffex
For the rear, turn the adjusting barrel on the rear derailleur and/or shifter left. And for left, that is, looking head on. So stand behind the bike and look at the rear wheel. From that angle, left. For the shifter, face the front of the bike. That left. For the front, turn the adjusting barrel on the shifter right. That is, facing the front, turn it right. That should do it.. assuming you didn't move the front derailleur around or unhook the cable.
Well, my rear derailleur shifts like magic now. No cables replaced, it was purely a tension issue.