Bicycle Mechanics - Cable in frame
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08-26-08, 11:27 AM
I have a Trek 600 from 1985. The rear derailer cable runs through the chain stay. The holes are barely larger than the cable, not enough room to fasten a wire or string to the old cable to pull it through. What is the best way to get a new cable through it?
08-26-08, 11:34 AM
I had the same problem with an old TREK 420. I solder the cable end to make a solid point and just got lucky on the third try. Cheers Scott
I have heard of people using compressed air to blow a string through to use to pull the new cable. I have also heard of using a piece of heat shrink tubing to joing the end of the old cable to the new cable, without much change in diameter in order to pull a new cable.
Have not used either method.
Before you remove the old cable, tie, or glue, a piece of thread (not string) to the end of the old cable and pull it through. Then tie, or glue, the thread to the end of the new cable and use that to guide the cable through the holes. Be gentle so you don't break the thread.
If you've already pulled the old cable out, then use a vacuum cleaner with a rag around the end of the nozzle to apply suction to one of the holes. Feed the thread into the other hole and it should get sucked through.
08-26-08, 12:31 PM
Slip a shifter cable into the housing and then feed the cable through the hole in the rear stay and then fish / guide the cable end out at the rear... a bent piece of spoke works pretty well for this.
Once the cable end is out use a vice grip or pliers to grab the cable end and pull the cable and housing through (the cable end will butt up against the housing) and once the housing comes through everything is golden.
It's actually pretty easy.
08-26-08, 12:32 PM
Try a powerful magnet--if you get the cable close to the hole, the magnet should draw it to it.
08-26-08, 12:34 PM
You guys are making this too hard.
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