The cable end is seated all the way in the shifter, fed through to the guide and the cover, I lubed the shifter cable guide slightly, routed the cable through the housing into the frame, out of the bottom bracket base of the frame where the plastic guide is, over the guide as properly routed, into the FD and attached with a bit of strength enough to remove any slack.
Barrel adjuster was completely backed off when the cable is attached to the FD.
The shifter works fine while not hooked up, the shifter also works fine while hooked up with basic tension but does not move the FD.
Increasing tension via the barrel adjuster for the FD slightly still does not allow for the FD to shift. Increasing tension further allows for the FD to shift but at extreme tension and leverage on the from shifter almost feeling like breaking it. You can see at the end of the second video I cannot even do it with one hand leveraging my thumb off the bar while recording with the other. That was a lot of power just for it to not shift.
I don’t know what the fuck is wrong with this but this is the reason why I replaced my house and cables because I thought the inadequate FD performance and tuning was due to cable stretch and trying to solve it by increasing the tension via barrel adjuster before on the old housing and cables resulted in the same problem with the front shifter.
Please help.
[Videos] cannot get fresh cable install to work, followed the proper process, replaced new housing, new cables, routed them and adjusting tension causing the shifter to seize and and still not be able to shift FD.
byu/Sivadbk inbikewrench
by Sivadbk
6 Comments
The cable is being pulled in the initial video I was trying to show that it’s not defective and does indeed shift properly at the shifter but the video doesn’t show too well in the video. I figured a lot of people would likely comment on the possibility it doesn’t work but it does.
The angle of the cable vs the movement of the FD arm looks wrong to me. The cable looks like it pulls down, where as the FD arm needs to move across first. Are you missing a cable guide or pulley?
It looks like you might have the cable routed wrong through the front derailleur clamp, but the video shot over it so fat I could barely see. Does the cable come up the inside (nearest the seat tube) or the outside (nearest the crank arm). That can genuinely make a difference.
https://preview.redd.it/j5jmlva1za9h1.jpeg?width=1170&format=pjpg&auto=webp&s=f663cca6db51becb9f2c5b320124718ac60f15cb
This cable routing can’t be right. See if you can find the setup manual for your model of derailleur and compare against that.
Double check that the head of the cable is properly seated in the shifter. Shift all the way to the smallest cog (fully slack) and then take a closer look at the dead end to ensure it’s sitting all the way in its well. This has gotten me before.
ETA: I see from your initial comment that the cable is seated, so the next thing I would look at is the limit screw on the derailler itself to make sure it hasn’t vibrated down or is otherwise malfunctioning. Can you swing the derailler thru its entire range by hand?
Seems like a routing issue. I had a similar looking problem on a bike I recently built that has partial internal routing. The frame came with a clear plastic cable guide (like a straw?) inside the frame that I fed the cable through, but it caused the cable to bind up and the shifter to seize. To fix it I had to pull the clear plastic guide and run the cable bare when inside the frame. Does your cable housing enter the frame or does it have some kind of sleeve?