Front Derailleur cable routing help, please....
04-07-15, 07:17 PM
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Front Derailleur cable routing help, please....
Shimano Dual SIS. I have routed the cable from shifter to the screw that secures the cable to the derailleur unit.... Even looking at PDF's of old manuals, I can't figure out proper routing....
The terminus is a square post. A 5mm screw affixes a small plate with two flanges on opposite sides that grip the post, and a third flange (90 degrees to the other two and pointing up).... Foolishly I removed the former cable without observing the routing.... The bike is a Trek 800. The cable is properly routed through the guides under the bottom bracket, but how to attach to the front derailleur is a mystery....
Help?
The terminus is a square post. A 5mm screw affixes a small plate with two flanges on opposite sides that grip the post, and a third flange (90 degrees to the other two and pointing up).... Foolishly I removed the former cable without observing the routing.... The bike is a Trek 800. The cable is properly routed through the guides under the bottom bracket, but how to attach to the front derailleur is a mystery....
Help?
04-07-15, 08:35 PM
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A few photos? Andy
04-08-15, 06:10 AM
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Then perhaps a model number or a link to an on line image. Dual SIS could mean any of a number models to us. I started to reply with a detailed description of the early road bike ft der SIS attempts but stopped when I decided that my time might not apply. As well as trying to describe a shape complex shape and relationship with just words. Andy.
04-08-15, 06:20 AM
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To AS -- I believe the OP is describing a pinch bolt washer with bent tabs extending from it, as was (is?) common on many Shimano derailleurs.
To the OP -- hopefully I've properly translated your description and AS can give you specific info since he's far more familiar with various Shimano designs than I am. But the general rule for cable routing is for the wire to be roued as far out on the swing arm as possible, and under the side of the pinch bolt farther from the pivot. You might even see a groove or discoloration on the arm where the cable used to be.
To the OP -- hopefully I've properly translated your description and AS can give you specific info since he's far more familiar with various Shimano designs than I am. But the general rule for cable routing is for the wire to be roued as far out on the swing arm as possible, and under the side of the pinch bolt farther from the pivot. You might even see a groove or discoloration on the arm where the cable used to be.
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FB
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
04-08-15, 08:24 AM
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Thanks for the effort, gentlemen, it may prove useful as I do remember a discoloration pattern on the tab.... Today/tomorrow I will try the advice....
04-08-15, 11:21 AM
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04-08-15, 11:33 AM
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The great thing about English is that we have a name for everything. OTOH - had I written "witness mark" I'd have had to follow it with "a stain or......" in order to be understood.
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An ounce of diagnosis is worth a pound of cure.
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FB
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
04-08-15, 11:40 AM
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04-08-15, 03:03 PM
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Derailleurs are weird.
Forget about the housing and cabling and observe how your derailleur works.
Grab the cage and move it back and forth and keep your eye on the cable bolt. Now imagine it with a shifter cable on there.. is the cable supposed to be pulling up, down, or is the housing pushing up the derailleur. (lol at the Weird 1970's mechanism)
Now, try to find a hole or housing that will fit it. I would try to work back from the derailleur to the shifter. I noticed on a picture from the 800 that one of them has a cable directly above the derailleur indicating it is a "pull-up" mechanism.
Derailleurs are weird.
Forget about the housing and cabling and observe how your derailleur works.
Grab the cage and move it back and forth and keep your eye on the cable bolt. Now imagine it with a shifter cable on there.. is the cable supposed to be pulling up, down, or is the housing pushing up the derailleur. (lol at the Weird 1970's mechanism)
Now, try to find a hole or housing that will fit it. I would try to work back from the derailleur to the shifter. I noticed on a picture from the 800 that one of them has a cable directly above the derailleur indicating it is a "pull-up" mechanism.
Derailleurs are weird.
04-09-15, 08:07 PM
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Success my friends! My 90's Trek 800 has mutated from a 7 speed to a 9 speed
Thanks for hanging in there with a newb till he graduated his first baptism of fire....
Test ride today suggests a small adjustment to the front derailleur and I still don't have the 9th speed in play, but I understand that to be a needed adjustment to the (lower?) bound screw on the rear derailleur....
All in all, it is like having a new bike!
Thanks for hanging in there with a newb till he graduated his first baptism of fire....
Test ride today suggests a small adjustment to the front derailleur and I still don't have the 9th speed in play, but I understand that to be a needed adjustment to the (lower?) bound screw on the rear derailleur....
All in all, it is like having a new bike!
