So my rear derailleur and front shifter have stopped working together, my shift can shift once up and then nothing. My bike has essentially turned itself into a 2 speed.
The shifter is a 2300 shifter and the derailleur is a 105, both compatible with each other and my 8sp cassette (I know this because it has been working fine for a year).
So the other night I moved my cable because it was kinda blocking my light and then all of a sudden my derailleur and my shifter had disengaged and I was stuck in 1st gear.
I thought possibly the cable had slipped from the rear derailleur and that was the issue so I tried adjusting it with no improvement (in fact I made it slightly worse because I am now stuck in my highest gear).
My question I suppose is, how do I figure out if it is the derailleur or the shifter and does anyone have any idea how to fix it? The shifters seem like black magic since I can't really see what they do and all the mechanisms and screws are hidden away. I may need to replace the cable as I have kinda messed it up and got it all frayed and prickly (lost the nipple), how difficult a job is that?