Originally Posted by
tjspiel
I've ridden in temps well below 0 F and never had this problem. I have had cables freeze near the derailleurs and it tends to happen when temps dip below freezing after riding in slushy/wet weather. They loosen up after a bit. Make sure you're lubing the cables.
Its always been the shifter. I could never hear or feel it click to the next gear. So, I would move it back and forth for about 10 min and eventually, I think, it would warm up and I could shift down.