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Old 01-03-06, 10:41 PM   #1
BluesDawg
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I'm building up a 1989 Trek 970 MTB frame that has top tube cable routing. All the bikes I've had before ran the derailleur cables under the bottom bracket. I can see how the rear shift cable will run down the seat stay to the derailleur but I can't figure out how to run the front der. cable. I don't see any cable housing stops on the seat tube.
Do I just run the housing all the way from the cable stop at the rear of the top tube to the front derailleur? Or maybe I should add some kind of bolt on cable housing stop on the seat tube.
There is what looks like a bushing bolted to the back of the bottom bracket shell. Would that be for turning the cable up toward the derailleur? I am using a Deore front derailleur which is supposed to be capable of bottom or top pull routing.
- Thanks

Last edited by BluesDawg; 01-04-06 at 11:10 AM. Reason: clarification
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Old 01-04-06, 11:42 AM   #2
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If there is no cable stop one will have to be added. I'm not familiar with your bike but I don't see how they got by without one. Most MTBs I've seen have a stop 2 to 3 inches below the seat tube, top tube joint. This makes for a short piece of housing from the top tube stop the the seat tube stop.

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Old 01-04-06, 12:55 PM   #3
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Older front derailleurs had a cable stop built into the derailleur. The cable housing was run all the way to the derailleur, and then a short length of bare cable went from the built-in stop to the bolt on the derailleur that secures the cable. If you're going to use a newer front derailleur, you can get a clamp-on cable stop and position it on the seat tube wherever you want it-

Last edited by well biked; 01-04-06 at 01:06 PM. Reason: spelling
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Old 01-04-06, 11:37 PM   #4
BluesDawg
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Thanks. That make sense.
I've rigged it up with a too small downtube clamp-on cable stop that came with a set of Suntour barcons. I have it held on with a zip tie. Works fine and will have to do until I can find a proper clamp-on. So far I can only find them with two holes made for the downtube.
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