can rear der problem cause problem up front
I was riding my mt bike yesterday on a group ride. My chain was slipping something terrible front and back. A guy on the ride who turns a wrench for lbs gave me suggestions about chain length, and b screw. Going buy what he said, and park tools online help, I was able to determine that my problem was the jockey wheel was hitting cassete, and my chain was to long. Here is my question. Can these problems cause the middle ring to jump to smaller ring? Is there anything else I should check before I ride tommorow? I have a brand new drive train. When I installed the front Crank(new)and bb(new) I had to move the der towards the big ring. This leads me to believe that the front rings now sit more to the right than the old ones.Any suggestions would be appreciated.