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Old 12-16-07, 11:36 AM   #1
redbear12
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Internal cable routing bar end shifter

I am pretty sure this is a pretty noobie question, but hoping for some help.

I recently bought a Specialized Transition frame and I am installing dura ace bar end shifters on aero bars. The bike is setup for internal cable routing, so no casing stop. I, of course, have never wired this type of setup.

So here is the issue, hopefully this will make sense. In wiring the front deraileur, there just seems to be so much slack in the cable that there is not enough tension to move the deraileur. To get enough tension, I of course cannot move the handle bars to turn.

So any advice on cable routing this type of setup. Thanks in advance.
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Old 12-17-07, 10:16 AM   #2
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You might have to run cable housing all the way to the deraileur, or somewhere you are missing a cable housing stop, as you should never have the problem you described. Make sure there is enough housing length between the aero bars and frame to allow for movement.
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Old 12-17-07, 11:01 AM   #3
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thx. i do have cable housing the whole way from the aero bars to the frame, but it still does not seem to be helping and i am not quite sure what i am missing
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Old 12-17-07, 11:24 AM   #4
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to clarify (I appologize for the n00bie-ness of this question), the setup is like figure 1 here:
http://www.parktool.com/repair/readhowto.asp?id=140

when i look at my other road bike (allez with external routing and standard sti levers), the cable bt the front deraileur and the cable stop on the head tube is taut and then bt the cable stop and the handle bar tape, it is not taut, but rather there is enough cable so that you have full range of motion of the handle bars.

with the new one, like the picture in the link above, there is no cable stop on the head tube, so, as you can see with the picture, the cable is "loose" so as to allow for full range of motion of the handle bars. The complication is that the bar end shifters are a simple lever, which seems to need to put tension on the cable to shift the deraileur, which seems to need to be taut to operate.
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Old 12-17-07, 11:58 AM   #5
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The housing goes all the way through the frame to a housing stop somewhere between the derailler and the point where the cable and housing come out of the frame.
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Old 12-17-07, 12:00 PM   #6
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I think you are confusing the cable housing with the the inner wire (the actual cable). The inner wire has to be taut to operate the derailleurs but the cable housing can be long enough and routed in a curve where ever you need it to get free handlebar rotation. The inner wire will follow the housing curve but must be taut within the housing. If the cable runs inside the frame tubes, the housing must go there also.
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Old 12-17-07, 12:29 PM   #7
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Quote:
Originally Posted by HillRider View Post
I think you are confusing the cable housing with the the inner wire (the actual cable). The inner wire has to be taut to operate the derailleurs but the cable housing can be long enough and routed in a curve where ever you need it to get free handlebar rotation. The inner wire will follow the housing curve but must be taut within the housing. If the cable runs inside the frame tubes, the housing must go there also.
alright, i think i got it. so basically run the inner wire through the cable housing the length of the distance between the shifter and the deraileur; turn the handle bars to the furthest point of rotation; pull the inner wire taut and secure it in the deraileur?

thx for the help all
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Old 12-17-07, 07:42 PM   #8
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Originally Posted by redbear12 View Post
alright, i think i got it. so basically run the inner wire through the cable housing the length of the distance between the shifter and the deraileur; turn the handle bars to the furthest point of rotation; pull the inner wire taut and secure it in the deraileur?

thx for the help all
When setting up, you turn the handlebars side to side to make sure the housing is long enough. When you are pulling taut the wire to set up the derailleur, your handlebars can be in any position; the length of cable housing remains constant regardless.
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