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front derailleur cable(6 posts)

front derailleur cableslug
Feb 10, 2002 10:24 PM
probably no big deal but is the derailleur cable supposed to roll along the black plastic roller thingy in pic below of my d/a shifter, instead of where it's at. snuck a look at LBS bikes, and many bikes had cables set-up like in the pic instead of the cable on top of the "roller." i tried placing cable so it would roll along the thing, but it would eventually go to the side of the roller thingy. and cable guides on bottom bracket can't really be moved much to guide cable to "correct" position. seems like a lot of wear the way the cable is rubbing across edge of the thing. wouldn't have noticed til i installed f. drllr on to new bike. thanks.
black plastic thingyPaul
Feb 11, 2002 6:38 AM
No, it doesn't roll along the plastic thingy. It shouldn't be rubbing against any part of the derailleur. The shifter is just moving (pushing) the derailleur cage so that it slides the chain over the outer chain ring, and holds it in place till it's released by the shifter. The cable should just be pulled tight and held in place by the allen screw.
re: front derailleur cablestr8dum1
Feb 11, 2002 9:33 AM
paul hasnt built up a bike. The pic is correct. The cable should be as staright as possible. All trhe bikes i've built with bottom pull FD's hav eteh cable sliding over that plastic piece
have built up several bikesPaul
Feb 11, 2002 10:38 AM
Have followed the instructions, and haven't had a problem. The cable is next to it, and is straight.
re: front derailleur cableAndy M-S
Feb 11, 2002 11:16 AM
If that black plastic piece is what I think it is, you're doing fine to forget about it. It's just a tubular cover over the derailer return spring. The cable should exit cleanly from the guide on the bottom of the BB and come straight up to the derailer cable bolt, as you have it.

The only way you could get the cable to ride over the black cover would be if you had reversed the cables through the BB cable guide, and that would probably lead to some shifting problems.

You're doing things right, near as I can tell.
re: front derailleur cableslug
Feb 11, 2002 1:42 PM
thanks to responders. probably was like this before, but had no problems shifting on my old bike, and none now. just checking.