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Old 01-11-12, 06:15 PM
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Anyone ever have trouble with...

So I'm switching out the bar-end shifters on a new (old) bike for down-tubes. I've gotten the shifters off no problem and I go to take the down-tube cable stops off, and they are stuck on with no apparent way to take them off. I cant seem to get any bite with an allen key or screwdriver in the hole that leads into the frame, it feels like there's just nothing in there. Maybe I'm there's I'm missing something here or maybe there's an actual problem but I feel like I've tried everything short of smashing them off. Any insights or advice anyone has would be awesome.

Thanks
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Old 01-11-12, 06:27 PM
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Once the center screw is off they should come off. Don't try twisting because they're keyed to the square DT boss. If they don't come off easily, maybe they're stuck in paint or someone might have used locktite. Use some gentle pressure and pry from the back, and that should do the trick.
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Old 01-11-12, 07:04 PM
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POST SOME PICS!!!! what kind of bike? steel?

I agree with FB, once you get the mounting screw off the cable stop should come off, no need to stick anything deep inside. you may need to grip them with pliers but they should come off.

the part that the cable stops mount to, the shifter bossm does not come off since you need to put the shifters on them

whatever kind of bike you have once you get the cable stops off these should remain
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Old 01-12-12, 12:52 AM
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Ok cool, so I just pryed them off, thanks. Another question though, do down-tube bosses come in the different sizes on different frames? I have a set of Campy Athena 7-speed shifters that dont seem to fit on my Colnago frame, which is running the rest of the components from the group. I've never installed down-tube shifters but I think I understand the basics but they just dont seem to fit. Thanks for any help
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Old 01-12-12, 06:46 AM
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Originally Posted by darinm
Ok cool, so I just pryed them off, thanks. Another question though, do down-tube bosses come in the different sizes on different frames? I have a set of Campy Athena 7-speed shifters that dont seem to fit on my Colnago frame, which is running the rest of the components from the group. I've never installed down-tube shifters but I think I understand the basics but they just dont seem to fit. Thanks for any help
Yes, they do come in sizes depending on the diameter of the downtube.

Whenever I've bought a new set in the past (Shimano) they came with 2 sets of bases to match large or small diameter down tubes. I'm thinking that if you have a good relationship with an LBS they probably have a few left over sets in the small parts bins.
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Old 01-12-12, 07:22 AM
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in the early '80s shimano had a funny boss but most all bikes use a "Campi Style" boss with a square base. as Grouch noted shimano sifters come with different backing plates to fit the curve of tube diameter.

Athena 7spd shifters? so those are Synchro shifters? are you going to run them in friction moed? what kind of brifters were on the bike?
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Old 01-13-12, 02:39 PM
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Well the base plate fits onto the squared base of the boss, however it's not rounded to the tube. Its basically just a washer with the hook on it. It's the actual shifter that doesn't fit; the part that extends from the base, circular with two flattened sides, is to big for the shifter. The shifter has the same shaped hole just a little smaller.

Yes, they are Synchro shifters, but not with the friction mode switch. I'd prefer friction but I didn't like the bar-ends so I was just going to use Synchro ones until I find a nice set of friction shifters. That gets me thinking though, is there something you can take out of shynchro/indexed shifters to make em friction? Assuming there's some way to get them on the bosses in the first place
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Old 01-13-12, 04:31 PM
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2 things

1, take some sand paper or an emory board (ASK YOU GF?WIFE BEFORE YOU USE IT. DO NOT PUT IT BACK) and remove the paint from the bosses. {Campi used to make a tool for this**

2, the left/rear shifter should mount just like a normal. you sort of have to stack or assemble the shifter as you put it on.


there is nothing you remove to make them friction but more of how you adjust them. that is what the ring/disc on the side of the rear shifter is for.

do a search on here and see if you can find a diagram of how they go togather
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Old 01-13-12, 04:49 PM
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I am not sure which shifter you ave but here is a diagram of the first style hopefully it will help

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Old 01-13-12, 08:06 PM
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Hmm well I just tried that with only some success. I guess just to clarify, do shifter bosses ever come in different sizes?
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Old 01-13-12, 08:14 PM
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No.

once upon a time there was a different base used for bikes with some shimano groups but unless your frame is from the early '80s that should not be an issue. all bosses with a square base are the same size. pics?
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Old 01-13-12, 08:20 PM
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Generally no, the boss diameter and flats are from a time when there were an industry stander.
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Old 01-13-12, 08:27 PM
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Here is a pic of the Synchro 2 shifter assembly. it has been awhile but IIRC the part #7 does fit tight, I believe that is part of what makes them work.

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Old 01-13-12, 08:33 PM
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Originally Posted by darinm
Hmm well I just tried that with only some success. I guess just to clarify, do shifter bosses ever come in different sizes?
Yes, but the "other" size is very rare, and only appears on Japanese-made, Shimano-equipped bikes. It's identifiable by an odd 4.5mm thread.
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Old 01-13-12, 09:24 PM
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Thanks everyone, and that is the design I'm working with BianchiGirl, and #7 is the part I'm having trouble with! it fits onto the tip of the boss but wont get onto the bottom, fully-rounded part, even after filing the paint off. I guess I'll just work at it more and thanks everyone
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Old 01-14-12, 06:49 AM
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It is a good thing I like you. I just dug through my stuff and found a set of NOS Synchros ( they came with a NOS group I bought) anyway I tried the shifter on a frame here with no evidence of paint on the boss and it does not seem to fit even if I remove it from the shifter.

as I mentioned earlier Campi used to make a tool for preping shifter bosses, so perhaps you need to take a bit more materiel off.

personally I would look for some type of retro friction or some shimano shifters and just run them in friction mode. I think you'll be happier in the long run.
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Old 01-14-12, 03:34 PM
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Wow, thanks for that, it really doesn't feel like its going to go on. But since I dont plan on using these shifters for long anyway I guess I'll just wait till I find a new pair before I go filing away at my frame too much. I think I'll look for some Suntour friction shifters I've heard they are some of the best and there's a lot of NOS on ebay.
Thanks a bunch!
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Old 07-09-12, 08:31 PM
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Originally Posted by darinm
Thanks everyone, and that is the design I'm working with BianchiGirl, and #7 is the part I'm having trouble with! it fits onto the tip of the boss but wont get onto the bottom, fully-rounded part, even after filing the paint off. I guess I'll just work at it more and thanks everyone
I realise that this is an old thread, but I found it using the search because I just encountered the same problem: the right shifter would not fit on the downtube boss. More specifically, part#7, the collar, would not fit. These are Synchro 2, Chorus 7-speed.

I resorted to measuring with the calipers and found that the flats inside the collar were approximately 0.15mm narrower than the flats on the downtube boss. Maybe it could be pressed on? I took a small file and carefully took metal off both the boss and the collar (not much) until it could be pressed on with help of the shifter bolt.

Now that it is together, I understand what I have read about these. I've driven an old dump truck that shifted better . They work fine in friction mode though, and belong with the other Chorus parts, so they will stay.
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