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Criss-crossed cables on downtube(13 posts)

Criss-crossed cables on downtubeALLAH
Aug 21, 2003 1:22 PM
So, I had the drivetrain basically overhauled recently, and the mechanic did something strange to my cables. I have derailleur cables that go down the outside of the downtube. Instead of running the cables so that they are parallel down the downtube, he crossed them so that the cables actually cross each other. This creates a strange noise like two guitar strings rubbing together whenever I shift. Is there a reason he did this, or did he just screw up?

I don't like the noise and the crisscrossed cables interfere with my cadence wires. Am I unreasonable or just clueless for being a little annoyed?
there is a reason...mohair_chair
Aug 21, 2003 1:30 PM
Some guys build it that way because it allows better cable routing, theoretically to save the paint on your head tube.

Should you be upset? Maybe, but the guy was probably trying to help, so cut him some slack. Bring it back, mention the noise, mention the new criss cross, look bewildered, and let him draw the conclusion as to what should be done, to save him face. If he isn't too bright, suggest that maybe putting cables back might help, and maybe it shouldn't cost you anything.
That's how I do it...biknben
Aug 21, 2003 2:07 PM
The cables are less likely to rub against the head tube. If the cable housing stops are on the head tube it isn't a big deal. If your stops are on the down tube I'd say the wrench did you a favor and saved the paint on your head tube. Routing it this way also lessens curve of the housing between the shifter and the head tube.

On some frames, like my C'Dale the crossing cables are a little too close to the down tube and may hit it during bumps or rough pavement. I use rubber donuts to keep the chatter down.

In the pic you see a cluster of 3 donuts on each cable. I use a drop of Crazy Glue to keep them in place. It doesn't effect shifting at all.
Clear tape saves headtubes too....nmRusty Coggs
Aug 21, 2003 2:20 PM
nm
Yeah...I've used Park glueless patches too (nm)biknben
Aug 21, 2003 3:22 PM
if you don't care about asthetics, electrical tape works toolaffeaux
Aug 21, 2003 4:03 PM
Here's my bike:
Doesn't work on all bikes.Spoke Wrench
Aug 21, 2003 2:26 PM
I'm thinking that if you are getting a noise when you shift that the cables are actually rubbing the down tube. If that's the case, I'd reroute them parallel to the down tube if it was my bike.
I cross my cablesMGS
Aug 21, 2003 4:04 PM
I tried it both ways and find that when I crossed the cables there is less rub on the headtube and more importantly, since the bend is less acute across the headtube, I perceive an slight improvement in shifting.

Maybe I'm nuts, but that's my opinion.

He did you a favor.
I cross my cablesfiltersweep
Aug 21, 2003 5:41 PM
That is the main reason- at the headtube. My wife has smaller bars, and there is no way they can be setup without being crossed. Mine run parallel...
For cryin out louddave woof
Aug 21, 2003 6:17 PM
DO NOT cross the cables under the down tube!

eeeeshhh

If your cable housing rubs against the frame's head tube the deralleur cable housing is TOO LONG. This housing is meant to be trimmed - most people have not figured this out.

When bikes are built the shop techs are not going to take the time to do this. They just sell them with way too long housing.

I hate seeing $3000+ bikes with cable housing flopping all over in front of the bike. Ugh.

dave
I object-filtersweep
Aug 21, 2003 6:48 PM
if the cables rub, it is a design flaw (cost saving measure) of the frame- my Look simply does not that that problem while it is ubiquitous for Trek, Specialized, etc. aluminum frames.

The need for crossing cables has more to do with bar size than cable rub, IMHO. It sets up better angles.
For cryin out loudIDH2
Aug 21, 2003 7:03 PM
[quote]If your cable housing rubs against the frame's head tube the deralleur cable housing is TOO LONG[/quote]

ugh - not true Dave...if anything, a [i]slightly[/i] longer housing in front will prevent rubbing.

[quote]When bikes are built the shop techs are not going to take the time to do this. They just sell them with way too long housing[/quote] - ugh - also not true Dave...at least not in my experience...maybe you've been to a bad shop or two, but a good shop will hire and/or develop good mechanics and sales personnel....people who care about the work they do....perhaps you should find another shop to handle the mechanical issues your are uncomfortable with.

JMHO,
Paul
oppsIDH2
Aug 21, 2003 7:05 PM
sorry - I thought that was standard text coding :(