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Old 03-12-11, 04:54 PM   #1
dbakl
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Simplex demultilicator? What does it do?

I remember this coming up in a thread recently. What do they do?

Anyway, spotted 2 on ebay if someone needs:

http://cgi.ebay.com/Simplex-Demultip...0#ht_500wt_922
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Old 03-12-11, 04:56 PM   #2
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Cue Grand Bois in 3...2...
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Old 03-12-11, 05:13 PM   #3
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thanks for reminding me I needed to buy that $20 one
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Old 03-12-11, 07:10 PM   #4
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If I recollect accurately: the Simplex barcons wrap so much cable that it's difficult to find the friction-shifting "sweet spot" unless the demultiplicator is used, so that there's more rotation on the levers between each gear.
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Old 03-12-11, 07:24 PM   #5
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Yeah, the incoming cable joins the lever at a different spot than the outgoing cable so you get a different amount of pull.
The levers don't give the same amount of pull that the derailler wants so this converts it for you.
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Old 03-12-11, 07:28 PM   #6
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Does anyone know the ratio?
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Old 03-12-11, 07:30 PM   #7
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Quote:
Originally Posted by Charles Wahl View Post
If I recollect accurately: the Simplex barcons wrap so much cable that it's difficult to find the friction-shifting "sweet spot" unless the demultiplicator is used, so that there's more rotation on the levers between each gear.
Doesn't that work in a similar manner to a Shiftmate? If it does, would a shiftmate be useful for the same purpose as the original Simplex demultiplicator, as an in-line kludge for shifter-derailer cable pull issues?
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Old 03-12-11, 07:33 PM   #8
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I'll find out soon enough, but what I don't get it how the simplex units pull any more cable than say a campy bar end or even a suntour. I have all of them and mechnically they really seem to be the same.
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Old 03-12-11, 07:34 PM   #9
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and btw that guy must have a lot of them because he just relisted another one for $19 right after i bought mine

http://cgi.ebay.com/Simplex-Demultip...item4aa9726c4c
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Old 03-12-11, 07:46 PM   #10
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Yeah, so you can get the demultiplicators in bulk, but who can find the Simplex barcon levers that go with them?
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Old 03-12-11, 08:02 PM   #11
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I'll find out soon enough, but what I don't get it how the simplex units pull any more cable than say a campy bar end or even a suntour. I have all of them and mechnically they really seem to be the same.
Maybe it's the derailler that needs less than average pull?
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Old 03-12-11, 08:35 PM   #12
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Yeah, so you can get the demultiplicators in bulk, but who can find the Simplex barcon levers that go with them?
wasnt too hard to find the set I have if I remember correctly. They arent the retrofriction ones though.
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Old 03-13-11, 04:34 AM   #13
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I understand why it does this but I don't understand how. Please explain it so even I can understand.
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Old 03-13-11, 05:47 AM   #14
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Quote:
Originally Posted by dbakl View Post
I remember this coming up in a thread recently. What do they do?

Anyway, spotted 2 on ebay if someone needs:

http://cgi.ebay.com/Simplex-Demultip...0#ht_500wt_922

Mechanical advantage. At the pivot point you have a lever with two cable stops with two different lengths. The rear lever(shorter) moves farther than the front lever (longer)for the same amount of movement.
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Old 03-13-11, 07:05 AM   #15
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perhaps best to comprehend by illustration, see sketch (third picture):

http://velobase.com/ViewComponent.as...m=103&AbsPos=5
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Old 03-13-11, 09:32 AM   #16
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Cue Grand Bois in 3...2...
I've given up trying to explain it.

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Old 03-13-11, 01:46 PM   #17
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I've given up trying to explain it.

Does it DECREASE or INCREASE the pull? Not playing dumb, just never seen one!
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Old 03-13-11, 01:51 PM   #18
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It pulls more cable at the back side, so it increases the pull.
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