On my commute yesterday, I noticed that my right shifter was no longer 'clicking' when shifting my rear derailleur up into a larger sprocket. It still shifted fine, but I noted that I should look into it this weekend. On the commute in this morning, it stopped shifting altogether.
- Chain/derailleur is on the smallest sprocket. It is positioned fine, no noise.
- When I press the brake lever inwards to shift the derailleur up, it moves a bit until I can feel the shift cable tightening ever so slightly. The shift lever stops and feels locked at that point. (It will not go through it's full sweep inwards)
- The thumb lever on the sora shifter feels loose and has no tension. (Normal for when it is on the smallest sprocket)
- If I pull on the shift cable itself (cable is routed along the top bar of the bike) the derailleur moves smoothly through the gears on the cassette.
When it first happened, I played a little bit with the cable tension, but that effectively did nothing.
This has never happened to me before, does anyone recognize these symptoms and should I attempt a repair or are the internals likely broken in the shifter?