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simplex derailleur woes.

Old 04-19-05, 04:57 PM
  #1  
luker
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simplex derailleur woes.

The French engineers seem to be a little obtuse. I took a Simplex SX650 rear derailleur off a donor bike and moved it to the Vitus I'm building. A little like the idiot that I sometimes am, I didn't look to see how it was mounted to the donor frame. It's a rear derailleur, right? This one has a little plate behind the upper pivot, with a tab that faces toward the frame and behind that, a tab that faces out, traveling around the upper pivot body. So I sez to myself, this tab is the derailleur stop, just like derailleur stops everywhere. Goes behind the dropout mounting tab. And I hooked it up that way. and struggled and struggled to get the wheel on. I rode it that way for one ride, and then decided that the designer must have had something different (obtuse?) in mind...so i put the little tab in front of the dropout mounting tab. I can get the tire on now, and the derailleur seems to work better, but I'm suspicious that I still haven't gotten it quite right. Do you have to rotate the tab through another dimension or something? Any assistance will be greatly appreciated (it's currently cold in the garage!).
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Old 04-22-05, 08:34 AM
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Take a look at the closeup of the derailer on my Gitane. You can see where the tab goes. I believe it's the same derailer that you have, but my label fell off. All Simplexes mount the same way.

http://community.webshots.com/user/stringjerker100
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Old 04-22-05, 07:16 PM
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luker
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yah. That's exactly it. The tab goes in front of the hanger. After I moved it around I noticed a place on the vitus dropout that the tab kinda fits into...at least they agree to be the same as them ownselves. I still suspect that something must be a little haywire with the way I have it set up; it works fine but the derailleur doesn't wrap around the cogs very well...no B screw adjustment. Can you wind the spring in the pivot or something?
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Old 04-23-05, 08:27 PM
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I believe that the spring tension is adjustable, but I've never messed with it. They have no B screw, but it's interesting that they have a barrel adjuster. I wonder if it could be made to index if you could find a shifter that pulled the right amount of cable?
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Old 04-23-05, 10:25 PM
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I'm sure that it is indexable, but probably only over six cogs (at max). I have a seven speed freewheel on the bike (that was what was on the wheels when I set it up) and with simplex retrofrictions, I can just barely get enough travel out of the lever to get to all seven gears. Whatever works, I suppose. I'm almost all of the way to a mavic replacement group, and I'm sure that that'll work with seven. I missed all of this French stuff when it was happening, and its kinda like going back to school...
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Old 04-23-05, 11:09 PM
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Not to change the subject, but does anyone have a Simplex jockey wheel that they can spare? I have a Simplex derailluer that needs a replacement - the derailluer I have has a wheel that is missing half its' teeth. Makes the ride a bit "jumpy"......

John D.
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Old 04-23-05, 11:45 PM
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J.D., do you have any old SunTour rear derailleurs? I had the same problem with the Simplex Criterium on my early-mid seventies Peuguot PX-10. Most of the teeth on the lower jockey wheel broke off within the first 100 yards of riding the bike(it was last winter's project bike). I found that a jockey wheel from an old Suntour V-GT was a perfect replacement for it(unusual for anything French!).
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Old 04-24-05, 10:39 AM
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[QUOTE=Sierra]J.D., do you have any old SunTour rear derailleurs? QUOTE]

Thanks for the tip - I'll dig around in my parts box, but I think I only have a Suntour 7 LC in there. I have a pile of Shimano's, a couple of "Schwinn Approved" (Shimano, most likely), and maybe one or two of those ultra high quality Falcons.....

I tried a Shimano, and that didn't work. Right now, the Simplex has been replaced with a low end Shimano, but I'd like to get that Simplex whole again.

John D.
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Old 04-24-05, 08:44 PM
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I'm thinking that simplex is a 6mm bolt and shimano is a 5mm bolt and suntour can be, depending, either one, right? you probably need a 6mm pulley. I'll look through my junk
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Old 04-24-05, 10:21 PM
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Originally Posted by luker
I'm thinking that simplex is a 6mm bolt and shimano is a 5mm bolt and suntour can be, depending, either one, right? you probably need a 6mm pulley. I'll look through my junk
That is exactly the case. I tried drilling out the Shimano, but it went off-center and wobbled evern worse. Now I have a Shimano AND a Simplex missing jockey wheels.....

Thanks for looking!!

John D.
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