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105 front shifter issue...

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105 front shifter issue...

Old 07-30-17, 07:33 PM
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105 front shifter issue...

I have a 105 front downtube shifter with issues. It seems to have one "detent" and no real stops to its' travel either direction. When the shifter is in its one detented (is that a word?) position, it is not parallel to the downtube, but points up slightly. It operates the derailleur fine, but it's very annoying that it does not stop and line up with the down tube and rear shifter.

Any thoughts or ideas?
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Old 07-30-17, 09:23 PM
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You can make cable adjustments by tightening or loosening the cable at the derailleur to make it line up.
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Old 07-30-17, 09:35 PM
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I'd try pulling the lever off and rotate the lever boss cover 180 degrees.
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Old 07-30-17, 09:45 PM
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I've got the same issue. Following to see if you find a solution. It's a minor annoyance, but would be nice to fix.
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Old 07-31-17, 12:36 AM
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Shimano changed their shifters in the late 80's so that the right side never laid all the way down parallel with the downtube when in the small ring. If I recall, it was for safety and ease of use. So if your shifters are 1050/1051 or 6400, that's why. Remember that some Shimano shifters of that era also had to be 'wound up' on the left side to preload the resistance spring.
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Old 07-31-17, 07:37 AM
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Originally Posted by zammykoo View Post
You can make cable adjustments by tightening or loosening the cable at the derailleur to make it line up.
It is the front derailleur There are no cable adjustments.
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Old 07-31-17, 07:39 AM
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Originally Posted by brian3069 View Post
I'd try pulling the lever off and rotate the lever boss cover 180 degrees.
Thanks, but the lever is on correctly.
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Old 07-31-17, 08:03 AM
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For me, it's a 7-speed SL-1055 lever that is showing this symptom - or maybe it's a feature? I've had a 6-speed SL-1050 lever on the same bike, and it laid flat. I don't use the included boss cover, as the bosses are Shimano-specific. It's not a cable tension problem; the lever has a hard stop at about 15 degrees above the downtube.

@Thumpic, does this sound similar to your issue?
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Old 07-31-17, 08:18 AM
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Originally Posted by rccardr View Post
Shimano changed their shifters in the late 80's so that the right side never laid all the way down parallel with the downtube when in the small ring. If I recall, it was for safety and ease of use. So if your shifters are 1050/1051 or 6400, that's why. Remember that some Shimano shifters of that era also had to be 'wound up' on the left side to preload the resistance spring.
I agree, installed a new Dura-Ace shifter and wondered about the same thing, had to Google around. Turns out it is even mentioned in the instructions.
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Old 07-31-17, 08:49 AM
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Just the way they were lol, drove me nuts as I never had a lever that didn't lay all the way down when pushed forward. I changed the levers to fix the problem when I found out they were built that way on my Miyata 512.

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Old 07-31-17, 08:53 AM
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Originally Posted by Thumpic View Post
It is the front derailleur There are no cable adjustments.
Of course there is an adjustment. You loosen the cable clamp and shorten or lengthen the clamping position on the cable.
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Old 07-31-17, 10:34 AM
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Originally Posted by ecnewell View Post
For me, it's a 7-speed SL-1055 lever that is showing this symptom - or maybe it's a feature? I've had a 6-speed SL-1050 lever on the same bike, and it laid flat. I don't use the included boss cover, as the bosses are Shimano-specific. It's not a cable tension problem; the lever has a hard stop at about 15 degrees above the downtube.

@Thumpic, does this sound similar to your issue?
Yes it's similar, except there is no hard stop in any direction. There is just the one obvious detent at about 15 as you described.
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Old 07-31-17, 10:39 AM
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Originally Posted by Iride01 View Post
Of course there is an adjustment. You loosen the cable clamp and shorten or lengthen the clamping position on the cable.
You install the front derailleur in the correct position, you install the cable correctly, and beyond that there is no real cable adjustment. You simply set the derailleur travel with the limit screws. My issue is at the shifter.
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Old 07-31-17, 02:48 PM
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Originally Posted by Thumpic View Post
.............you install the cable correctly, and beyond that there is no real cable adjustment. You simply set the derailleur travel with the limit screws. My issue is at the shifter.
How short or long on the cable you clamp the cable on the derailleur determines what angle your shift lever on the down tube will be.

If you are supposed to have detents that you are missing then I'd suspect the angle on the lever is wrong. If that's not it, then is there a boss or bushing that can be rotated as someone else suggested?
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Old 07-31-17, 03:14 PM
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As I recall the 1050/1051 front shifters stop parallel to the down tube when in the low chainring position, provided that the mount bezel is oriented correctly on the shifter boss. I don't know about a 1055/1056 shifters.
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Old 07-31-17, 03:43 PM
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Originally Posted by Thumpic View Post
I have a 105 front downtube shifter with issues. It seems to have one "detent" and no real stops to its' travel either direction. When the shifter is in its one detented (is that a word?) position, it is not parallel to the downtube, but points up slightly. It operates the derailleur fine, but it's very annoying that it does not stop and line up with the down tube and rear shifter.

Any thoughts or ideas?
Originally Posted by ecnewell View Post
For me, it's a 7-speed SL-1055 lever that is showing this symptom - or maybe it's a feature? I've had a 6-speed SL-1050 lever on the same bike, and it laid flat. I don't use the included boss cover, as the bosses are Shimano-specific. It's not a cable tension problem; the lever has a hard stop at about 15 degrees above the downtube.

@Thumpic, does this sound similar to your issue?
It's a "feature". My RX100, SL-1050, and SL-1055 front shifters all do it.
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Old 07-31-17, 03:54 PM
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Yep, just checked and there is a detent and the lever will not move forward.
You can just see the lever peeking up from the other side.


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Old 07-31-17, 04:46 PM
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I have four bikes with 1050 shifters and they all sit flush/parallel to the down tube. I'm curious, do the OP's levers have full radiused ends or the blunter end of earlier lever versions?

Edit: I actually have 1050 front levers on four bikes. I run 6, 7, and 8spds. The rear levers are either an original 1050 match or another model modified to the 1050 front shifter profile...Lots of grinding, sanding and polishing...Not perfect but an easy pass to the untrained eye.

I could never get used to offset left levers. I sold Kevindale a near mint Tri Color set this year for this very reason.

Last edited by tyler_fred; 07-31-17 at 05:01 PM.
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Old 07-31-17, 05:54 PM
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Canadian.

Originally Posted by Slash5 View Post
Yep, just checked and there is a detent and the lever will not move forward.
You can just see the lever peeking up from the other side.


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Old 07-31-17, 05:56 PM
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Originally Posted by Slash5 View Post
I agree, installed a new Dura-Ace shifter and wondered about the same thing, had to Google around. Turns out it is even mentioned in the instructions.
Don't feel like the only one....BTDT. Doc probably has, too. Another reason I love DA DT shifters, the funkiness.
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Old 08-01-17, 02:10 AM
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I stand corrected, being out of town and not able to actually view my 1050/1051 bikes. The front lever changed with the 6400 and later series down tube shifters, e.g. 1055,7700, etc.
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