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Vitus 979 downtube shifter

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Vitus 979 downtube shifter

Old 04-04-18, 03:53 PM
  #1  
ghesso
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Vitus 979 downtube shifter

I'm assembling a vitus 979 frame with Dura-ace 7400 group.
In my frame the bosses of the shift levers are rotated 90 degrees, I have researched photo of the vitus 979 frame and I found some are mounted in traditional mode with the flared part parallel to the downtube, and others are oriented in perpendicular to the oblique tube.

With the bosses oriented in perpendicular as mine, the shimano levers sl-7401 or sl-7402 remain badly positioned and can not be positioned parallel to the downtube.

The bosses seem to be built in one piece, do you have experiences on this type of frame and shifter? tips?



Thank.
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Old 04-04-18, 04:07 PM
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You substitute the flat version of the boss cover. It looks like this and are common:

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Old 04-04-18, 04:38 PM
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Wait which picture is your frame...you posted 3 different ones
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Old 04-04-18, 05:32 PM
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MY frame is the same that light red, first and last image.
The other two images dark red and black are photo take from internet of the same model Vitus 979 but with shifter bosses correctly fitted, 90 degrees oriented compared to my frame as you can see.
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Old 04-04-18, 07:24 PM
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If you look in the screw hole at the drive side boss, you should be able to see the head of a screw that goes through the down tube an screws on to the base of the opposite boss. Removing the screw will not take the bosses off the down tube though, as I think the bases of the bosses are bonded on to the down tube with glue....
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Old 04-04-18, 07:59 PM
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Originally Posted by ghesso View Post
MY frame is the same that light red, first and last image.
The other two images dark red and black are photo take from internet of the same model Vitus 979 but with shifter bosses correctly fitted, 90 degrees oriented compared to my frame as you can see.
I'm sorry, I misunderstood what you were originally talking about. You're referring to the twin flats on the end of the braze-on shaft where the lever screw goes in. Right?



Looking at the above diagram and my own 6400 shifters, I don't see why the orientation of those flats would matter. They don't interact with the shifter. The inside of the shifter is round and has no spot where those flats are received (parts 10 and 11 in the diagram are well outside the shaft.)

Why can't you just ignore those flats, mount the shifter as if they looked like any other braze-on and get a normal orientation?
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Old 04-05-18, 01:42 AM
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Originally Posted by Chombi1 View Post
If you look in the screw hole at the drive side boss, you should be able to see the head of a screw that goes through the down tube an screws on to the base of the opposite boss. Removing the screw will not take the bosses off the down tube though, as I think the bases of the bosses are bonded on to the down tube with glue....
Inside the hole there is the head of a screw, but it's been there for 30 years I sprayed some WD40 but do not move. If I can disassemble into individual pieces, then I can rotate 90 degrees, otherwise it will not be possible because the curved parts no longer correspond to the frame tube. I think, however, that in addition to the screw pin are also glued.
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Old 04-05-18, 02:15 AM
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Originally Posted by Kontact View Post
I'm sorry, I misunderstood what you were originally talking about. You're referring to the twin flats on the end of the braze-on shaft where the lever screw goes in. Right?



Looking at the above diagram and my own 6400 shifters, I don't see why the orientation of those flats would matter. They don't interact with the shifter. The inside of the shifter is round and has no spot where those flats are received (parts 10 and 11 in the diagram are well outside the shaft.)

Why can't you just ignore those flats, mount the shifter as if they looked like any other braze-on and get a normal orientation?
I also looked at the Shimano diagram, and I thought that with the spacer washer (Item No. 6 for the aluminum frames) the lever did not interact with the boss, instead it is not.

I do not know the 6400, but the Dura-ace 7401 and 7402 internally are not round and fit perfectly into the flares of the boss.
I tried with RX100 levers and I can mount as you say, pity that the RX100 are not compatible with the rear derailleur 7400, and also I wants to assemble the bike with dura ace 7400 group complete.

Perhaps the cause of the problem are the boss for Campagnolo and not Shimano?, probably are a bit too long and the Shimano levers interact even a few millimeters.

I could try to thin or lower the pins so that the levers can rotate on the pins, the locking of the rotation will be the square pin.
But before doing that I'm looking for a less drastic solution.
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Old 04-05-18, 02:24 AM
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Originally Posted by Kontact View Post
I'm sorry, I misunderstood what you were originally talking about. You're referring to the twin flats on the end of the braze-on shaft where the lever screw goes in. Right?



Looking at the above diagram and my own 6400 shifters, I don't see why the orientation of those flats would matter. They don't interact with the shifter. The inside of the shifter is round and has no spot where those flats are received (parts 10 and 11 in the diagram are well outside the shaft.)

Why can't you just ignore those flats, mount the shifter as if they looked like any other braze-on and get a normal orientation?
I also looked at the Shimano diagram, and I thought that with the spacer washer (Item No. 6 for the aluminum frames) the lever did not interact with the pins/boss instead it is not so

I do not know the 6400, but the Dura-ace 7401 and 7402 internally are not round and fit perfectly into the flares of the boss.

I tried with RX100 levers and you can mount as you say, pity that the RX100 are not compatible with the rear derailleur 7400, and also I would like assemble the bike with the complete Dura-ace 7400 group.

Perhaps the cause of the problem are the boss for campagnolo and not shimano?, probably are a bit too long and the Shimano levers interact even a few millimeters.

I could try to thin or lower the boss so that the levers can rotate on the pins, the locking of the rotation will be the square pin.
But before doing that I'm looking for a less drastic solution.
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Old 04-05-18, 10:27 AM
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Originally Posted by ghesso View Post
I also looked at the Shimano diagram, and I thought that with the spacer washer (Item No. 6 for the aluminum frames) the lever did not interact with the boss, instead it is not.

I do not know the 6400, but the Dura-ace 7401 and 7402 internally are not round and fit perfectly into the flares of the boss.
I tried with RX100 levers and I can mount as you say, pity that the RX100 are not compatible with the rear derailleur 7400, and also I wants to assemble the bike with dura ace 7400 group complete.

Perhaps the cause of the problem are the boss for Campagnolo and not Shimano?, probably are a bit too long and the Shimano levers interact even a few millimeters.

I could try to thin or lower the pins so that the levers can rotate on the pins, the locking of the rotation will be the square pin.
But before doing that I'm looking for a less drastic solution.
This isn't a Campy thing - someone at the factor screwed up and it just didn't matter for most shifters.

You still have several options. This company sells replacement Vitus shifter bosses, so there may be a way to disassemble them and re-assemble correctly. I would email them to ask how to get the old bosses out:
http://www.guywires.com/salestuff/vitusparts.htm

Or, ask Vitus if it is possible to disassemble and reassemble:
Vitus

In either case, use a graphics program to make it really obvious what part of the boss you are talking about because there is no good term for those flats and enclose the photo. I would use parallel lines to make them stand out between normal and your bike.

Or you can simply file the flats you need onto the shaft in the correct orientation. When you're done the end of the shaft will be square, and should work perfectly.

Vitus frames were bonded at the joints, but I would be surprised if the shift bosses are glued in. There should be a way to get them apart without breaking anything, then reassemble with loctite in the correct orientation.This is what the inside looks like, if it helps:
https://www.worthpoint.com/worthoped...frame-21787370
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