Gear Sensor installation problem

[maxitwist]

Ive installed the sensor as per youtube video instructions, however I did damage the cable a bit when I removing the housing, and had to remove some strands from the cable.
And now, I can no longer use my 2 lowest gears. The bike thinks I only have 6 gears seemingly and nothing happens when i try to shift into lowest ones.
Ive no idea why that is and so dont know how to go about trying to solve it.
Any ideas?
Im not sure how shifting gears work in the first place tbh..

 

[maxitwist]

Well, Ive made it much worse. I tightened the cable and as a result i lost another gear, so I loosed it instead by pushing the cable back into the bike, and now ive lost all gears except the highest gear.

Pics may help.

Im guessing I need a new cable now?

 

[cyclebuddy]

It looks to me as if you just need to set-up your rear derailleur again. Plenty of articles and youtube videos to show you how to do that.

If all else fails/you feel you're out-of-your-depth, just take it to your local bike shop; it'll be a quick job to them.

 

[mr_ed]

You’ve not got the right cable outer caps on the entry and exit of the gear sensor either.

You need one the same as you’ve got by the barrel adjuster on your derailleur both sides then it is a nice tight fit.

Sort all the cable ends out and then it’s just a derailleur adjustment job. By shortening the outer, you’ve effectively made the inner longer and sent everything out of adjustment.

 

[guerney]

Deffo replace that cable! You might find that you need to adjust cable tension a second time, as the new gear cable stretches a little in use. That might be too much of a kink in the gear outer cable, between the gear sensor and the gears - I think you should keep that as straight as possible, for freer running cable within. A sticky pad under the gear sensor to hold it to the fear fork, and a couple of very small zip ties to secure it to the frame, is what I went with. I also wound a bit of waterproof self-amalgamating tape at both ends of the gear sensor, to keep water and dust out.