Hey people. I was on a ride yesterday and my front derailleur seems to be stuck. The weird thing is there have been zero previous issues, it was at the end of a 2-hour ride, and I was shifting with zero problems between small and big ring.

It's a Shimano 105 derailleur with integrated 105 brake-shifters. I should be able to just press the paddle in once and it will shift down.

I shifted to the large ring and was on flat ground for a while when I went to shift down to small, and it won't go. There's still tension in the cable (so it couldn't have snapped) but as I press the paddle in, nothing happens. The shifter doesn't budge even as I pedal.

I've never had this happen before and in five years of owning this bike that derailleur has never had a problem. Again —*there was NOTHING preceding it being stuck to hint that there's a piece of something jamming it or a broken cable. Like I said there's still tension on the cable.

I can't go to the shop today because it's a holiday here and everything is closed. Any tips on what to try?

If the cable broke or lost tension I would expect it to shift into the small ring since that is the direction the spring is tensioned. Unhook the cable completely and then try to move it by hand and see if it moves freely. Then while the cable is unhooked hold it tight in one hand and shift between gears and see if the tension on the cable increases and decreases properly. This should at least allow you to narrow down which end of the equation the problem is.