I’ve spent about the last year trying to stop my Fuji Cross Comp from ghost shifting. Every time I checked it on the stand it shifted perfectly. Often, I would have rides that it shifted fine. But most often I should shift and later when I put some power down, I’d get that loud shifting under load sound. Really annoying.
Early on I brought the bike into the shop, and they tested the rear derailleur hanger and said it was a bit bent. They bent it back a little, but said it was still off a bit. Seemed like the problem was better for a while, but it came back. So, I bought a new hanger to replace it. While I was replacing the hanger, I noticed the chain was actually broke. Not completely, but one rivet was loose. So of course, I replaced the chain.
For a ride or two the bike seemed fixed, but then the problem returned. Well for some rides, sometimes I wouldn’t notice it. What the heck.
I had checked the cable and housing before but decided to go back to it. I disconnected the cable from the rear derailleur and started checking that it would move freely through the housing. I found that it moved very inconsistently through the short piece of housing near the derailleur. Sometimes it would feel smooth, and then suddenly it would be difficult to move. The cable looked fine so I’m guessing the housing was either kinked or just dirty in some way that it would sometime slow the cable. So, I replaced this small piece of housing and now for the last few rides I have had no problems.
I’m guessing I would shift and the cable to bind up and not really shift. Then later I would put some power down and the cable would slip through the housing and cause the ghost shift. I would recommend you check the cables and housing first if you are having ghost shifting problems.
Here is a list of common issues that can cause ghost shifting:
- Cable not moving through housing smoothly. May be dirty housing, frayed cable binding, kinked housing… Replace housing and cable.
- Bent derailleur hanger. Replace hanger.
- Shifting not indexed properly/limit screws not set properly. Adjust indexing.
- Shifter broken and not functioning properly. Replace shifter.
- Chain broken or has a stiff link. Replace chain.
What room does a ghost not need in a house? A living room.