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Fr. Derailleur Housing Stop Prob. - Old Trek 950

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Fr. Derailleur Housing Stop Prob. - Old Trek 950

Old 03-15-09, 10:32 AM
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mdoleman
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Fr. Derailleur Housing Stop Prob. - Old Trek 950

I've just picked-up a nice old Trek 950 (1991 model year, I believe) mountain bike frame that I am looking to build-up. The first (hopefully only) problem I've run into is that, while the cable routing requires a top-pull front derailleur, there is no housing stop on the back of the seat tube, where I'd expect it--nor anywhere else, for that matter.

Not knowing much about "mountain" components, I assume that the bike must've originally been outfitted with a front derailleur that had an integrated housing stop, with the cable and housing just making their way, free-form, all the way from the top tube stop down to the derailleur. But as I gawk around at all the newer model front derailleurs available, I see none that include a housing stop.

So, aside from turning the bike into--say--a 1-by-9--how do I solve this problem? (I know that Problem Solvers makes a clamp-on housing stop, but it's a dual cable design, intended for the top tube, and I'd rather not use it).
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Old 03-15-09, 01:11 PM
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my 950 of about the same vintage used a strange system for actuating the front derailer. The derailer itself had the housing stop, and the cable ran straight through to a screw set above the bottom bracket. As a result, the derailer wasn't pulled by the cable, so much as pushed by the housing.
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Old 03-15-09, 01:20 PM
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Interesting as my recently acquired 1990 950 uses a standard bottom pull front derailleur. It has a plastic guide on the bottom bracket with grooves for both derailleur cables.
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Old 03-15-09, 04:06 PM
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My 990 uses the BB cable attachment too, I believe it's a 92 model but I could be wrong. Weirdest thing I've ever seen, but it gets the job done I guess. I am little nervous about the tire clearance to the FD cable housing, but I will probably leave it as is for the time being.,,,,BD

This was as found, I've done a little work on it since.

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Old 03-15-09, 04:32 PM
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yep, that's the crazy cable routing that my 950 has. Tire clearance from that cable seems like it should be a problem, but it's never posed a problem in practice.

Run a length of housing from the housing stop on the top tube down to the deraler, taking care to keep it as short as possible. Once that's in place, run a cable through the housing, and down to the pinch bolt on the bottom bracket.
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Old 03-15-09, 06:00 PM
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Since the OP doesn't have the original front derailleur, I think he's asking for a reasonable way to set things up with current components.
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Old 03-15-09, 06:15 PM
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You could try to find a clamp-on cable stop that will fit on your seat-tube... these used to be pretty common items at LBSs.
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Old 03-15-09, 09:09 PM
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Thanks for the input... I am starting to think that I may run this as a 1-by-9, after all...

Unless...

I have the vague notion in mind that I might be able to run the housing from the top-tube stop to a seat-binder-mounted cable hanger--a really long-ish one, like that made by Surly. This won't be a problem since the frame has an integrated hanger for the rear brake. The angle might be a bit tight, but I am thinking I might just be able to make it work.

Other than that, I think I would have to resort to one of those Problem Solvers stops. Or find an old front derailleur with an integrated housing stop and hope I never break it...
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Old 03-15-09, 10:00 PM
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Oops, thanks for pointing that out. I was assuming it was just a cable routing question.

Actually the derailleur has nothing to do with it. There's a bolt on adapter that may be available through your LBS. Mine uses a normal derailleur with a stop that bolts onto the cable binder of the FD. Loose screws might have something like it, or you might could use one of those old school caliper brake adjuster stops, from an old Dia Compe, etc to do the job. They usually have a threaded bolt mount, and a swivel that would take care of the cable angles needed for different FD position.,,,,BD
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Old 03-16-09, 10:20 AM
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Originally Posted by LarDasse74 View Post
You could try to find a clamp-on cable stop that will fit on your seat-tube... these used to be pretty common items at LBSs.
This is the simplest idea, sure, and the way I will probably go. But it makes me a little nervous to put one on the seat tube without some sort of stop--I have to believe that it would eventually slide down, over time. So I am looking for some kind of better solution.

I am starting to think that there are basically two options: either this is going to be a 1-by-9, or I am going to finally drag-out that brazing kit I've been threatening to use for so long, and try to braze a stop onto that seat tube, myself.

Thanks.
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Old 03-16-09, 10:26 AM
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Originally Posted by Bikedued View Post
My 990 uses the BB cable attachment too, I believe it's a 92 model but I could be wrong. Weirdest thing I've ever seen, but it gets the job done I guess. I am little nervous about the tire clearance to the FD cable housing, but I will probably leave it as is for the time being.,,,,BD

This was as found, I've done a little work on it since.


That is exactly the situation I've got. Thanks so much for the photo. If I could be so bold as to ask for a favor: would you mind snapping a close-up that exposes, more clearly, the way that set-up works? I would sure appreciate it! Seems like a crazy-weird set-up, but whatever works. So, is it just a normal, every-day, run of the mill front derailleur, or is it a model that is specific to the application? I've just never seen such a bizarre set-up...
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Old 03-16-09, 11:32 AM
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Measure your seat tube, then ask you LBS to get you the correct-sized version of the backstop from Problem Solvers (a division of QBP), or find a webstore using Google. I recently put a pair of these onto our tandem to install a third brake, and I'm very happy with them.
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Old 03-16-09, 03:42 PM
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Originally Posted by Chris_W View Post
Measure your seat tube, then ask you LBS to get you the correct-sized version of the backstop from Problem Solvers (a division of QBP), or find a webstore using Google. I recently put a pair of these onto our tandem to install a third brake, and I'm very happy with them.
Thanks. Seat tube OD is 28.6, so I am assuming that the 1.125" backstop should work. I am slightly put-off by a couple things: 1) they don't seem to make one with a single cable stop (nit-picky, I know), and 2) the product specification states something like `intended for top-tube use.' I translate that to mean `will slip if used in a seat-tube or down-tube application.' Maybe not, though... Also, I don't particularly like the aesthetic of slapping-on a lot of goo-gaws and thingamajigs as workarounds--again, very nit-picky...
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Old 03-16-09, 04:06 PM
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Originally Posted by mdoleman View Post
Thanks. Seat tube OD is 28.6, so I am assuming that the 1.125" backstop should work. I am slightly put-off by a couple things: 1) they don't seem to make one with a single cable stop (nit-picky, I know), and 2) the product specification states something like `intended for top-tube use.' I translate that to mean `will slip if used in a seat-tube or down-tube application.' Maybe not, though... Also, I don't particularly like the aesthetic of slapping-on a lot of goo-gaws and thingamajigs as workarounds--again, very nit-picky...
You fear of the clamp sliding is unfounded. These clamps were designed for brake cables, which must pull with much greater force than shifter cables. If you get one that properly fits the diameter of your seat tube then it will not slip.
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Old 03-16-09, 05:47 PM
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Yeah, it's just a regular derailleur, with a pivoting stop bolted on where the cable would be pinched on a bottom pull. I know beause I switched to period Deore XT derailleurs, and all I did was swap that binder/stop onto the "new" FD. Let me see how hard that bike is to dig out at the moment. Tomorrow afternoon I get off at 3, so I will have more daylight, if it's really buried.,,,,BD
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Old 03-16-09, 09:12 PM
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I have the same setup. So basically the housing goes down to the pivoting stop bolt on the derailer then the cable is pinched at the bracket under the bike?
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Old 03-16-09, 11:09 PM
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Sorry, I promised this much earlier this evening. Here yah go!,,,,BD


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Old 03-16-09, 11:10 PM
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I only hit the button once, not sure what happened?
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Old 03-19-09, 11:00 AM
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Wacky

Originally Posted by Bikedued View Post
Sorry, I promised this much earlier this evening. Here yah go!,,,,BD


Ok, that's really oddball... So, next silly question: where on Earth do I pick-up one of those crazy housing-stop-adapter plate gizmos?

I definitely am starting to think that I am going to "Solve" this "Problem" with one of those Problem Solvers Backstop thingies and a top-pull derailleur.

Thanks, though--I appreciate the effort to take the pic and post it--it's all clear now.
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Old 03-19-09, 11:17 AM
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I like the problem solvers doohickey. Bike Tools Etc. carries a Tektro version that I've never seen anywhere else, including Tektro's site. Looks pretty similar - maybe problem solvers got Tektro to make it for them for a while, then switched to QBP?
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