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Replacing a simplex prestige

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Replacing a simplex prestige

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Old 10-17-12, 04:29 AM
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philg
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Replacing a simplex prestige

I wish to replace a common claw mount simplex prestige derailleur with another simplex of better quality, such as an sx410. Most of these seem to be the frame mount type however.

Is it possible to reuse the claw mount, possibly tapped out, or find a claw adapter to suit a frame mount simplex?
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Old 10-17-12, 05:31 AM
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You would be much better off replacing the Simplex with a Suntour.
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Old 10-17-12, 05:55 AM
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Originally Posted by Grand Bois View Post
You would be much better off replacing the Simplex with a Suntour.
Thanks, I may well do that. I presume you mean a claw mount suntour?

Now supposing I wanted to use a simplex, would it be possible to use a frame mount simplex derailleur with a frame designed to use a claw?
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Old 10-17-12, 06:32 AM
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Originally Posted by philg View Post
Would it be possible to use a frame mount simplex derailleur with a frame designed to use a claw?
I think in general yes - just bolt the RD to the claw. But older simplex RDs are made for Simplex dropouts. Not sure if the Prestige claw uses that style or standard. But I would echo those who recommend getting a 70's Suntour - Vx or V. Best $20 you'll spend on a bike.
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Old 10-17-12, 06:49 AM
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I presume I would need a claw type Suntour derailleur, or a frame mount with a standard claw adapter. I presume I could just use a Shimano with a claw adapter too - it's just a 5 speed with a friction shifter.
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Old 10-17-12, 06:53 AM
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I'm pretty sure all Simplex derailleurs use the same mount, whether they're mounted to a Simplex claw or Simplex dropout hanger. So attaching a Simplex claw to a higher end Simplex derailleur designed for a Simplex frame hanger should work fine.
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Old 10-17-12, 03:07 PM
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Originally Posted by southpawboston View Post
I'm pretty sure all Simplex derailleurs use the same mount, whether they're mounted to a Simplex claw or Simplex dropout hanger. So attaching a Simplex claw to a higher end Simplex derailleur designed for a Simplex frame hanger should work fine.
That is not correct. A Simplex made for use with a claw uses a different pivot bolt.
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Old 10-17-12, 03:33 PM
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Originally Posted by philg View Post
Thanks, I may well do that. I presume you mean a claw mount suntour?

Now supposing I wanted to use a simplex, would it be possible to use a frame mount simplex derailleur with a frame designed to use a claw?
Does your frame have a derailleur mount on the dropout? Or is it without one? If it has one, what is the hole size and threading? Or, is it a straight hole with no threads? If the dropout has no derailleur mount you have to use a claw.
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Old 10-17-12, 04:05 PM
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Originally Posted by Grand Bois View Post
That is not correct. A Simplex made for use with a claw uses a different pivot bolt.
From this photo from the harris cyclery derailleurs, it looks like it might be possible to reuse the pivot bolt from the claw mount derailleur to retrofit the frame mount derailleur.
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Old 10-17-12, 04:27 PM
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Take a closer look. One, RDF37 takes a threaded stud, back side of the dropout hanger, RDF35 is a hollow nut, threaded inside, which requires a male threaded hanger bolt.
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Old 10-17-12, 04:34 PM
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Originally Posted by rootboy View Post
Take a closer look. One, RDF37 takes a threaded stud, back side of the dropout hanger, RDF35 is a hollow nut, threaded inside, which requires a male threaded hanger bolt.
Yes I see the pivot bolt and nut/stud is different, but it looks as if you could use the RDF37 derailleur with the RDF35 pivot bolt and nut to attach the RDF37 derailleur to the claw.
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Old 10-17-12, 05:03 PM
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Well, you could try it. But good luck getting that upper pivot spring located in there and tensioned correctly.
If it were me, I wouldn't take a Simplex derailleur upper pivot apart unless I was seriously bored.
And probably not even then.
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Old 10-17-12, 05:51 PM
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I've been seriously bored and taken them apart more than once. the derailers are the same, but the pivot bolts and associated parts are different. I have swapped them and it works. Why bother unless it's important to you to keep it French? Most any Suntour will perform better than even a high end Simplex Super LJ and cost much less.

Most of my French bikes have Simplex derailers, but I'm aware that I'm giving up performance for authenticity. You have to decide which is more important to you.
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Old 10-17-12, 09:22 PM
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Originally Posted by Grand Bois View Post
I've been seriously bored and taken them apart more than once. the derailers are the same, but the pivot bolts and associated parts are different. I have swapped them and it works. Why bother unless it's important to you to keep it French? Most any Suntour will perform better than even a high end Simplex Super LJ and cost much less.

Most of my French bikes have Simplex derailers, but I'm aware that I'm giving up performance for authenticity. You have to decide which is more important to you.
Good to know. At least there's hope now that I can use my SLJ5500 on my Jeunet without a DO hanger, if I opt to, by just using the pivot bolt from the cheap claw Simplex that's on there now.
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Old 10-18-12, 07:31 PM
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I didn't say that all models of Simplex derailers use the same pivot bolt. I've swapped between two SX610's. I wouldn't expect parts from a Prestige to fit a Super LJ, but I haven't tried it.

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Old 10-19-12, 08:25 AM
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Originally Posted by Grand Bois View Post
I've been seriously bored and taken them apart more than once. the derailers are the same, but the pivot bolts and associated parts are different. I have swapped them and it works.
GB, I'd be very interested in hearing about your experiences doing this, especially this: how does one wind up, ie, tension the upper pivot spring? I haven't looked at my Criterium closely in a while but can't figure out how they did that, once the "locating ends", if you will, on the spring, are in their respective holes?
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Old 10-19-12, 08:29 AM
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I have a 410 I got for a Peugeot that is now sold. Can't remember if it has the claw or not. PM me if you would be interested in in it. Also have a Prestige in GC!
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Old 10-19-12, 08:33 AM
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Almost any Simplex RD that did NOT have built in hanger/claw will work on an older frame.

More modern Simplex RD like the SX series have tang thats located on the front side that allows them to work on Simplex style dropouts versus Campy style.

Info from my website..scroll down

http://cyclespeugeot.com/Threading.html
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Old 10-19-12, 08:53 AM
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Originally Posted by rootboy View Post
GB, I'd be very interested in hearing about your experiences doing this, especially this: how does one wind up, ie, tension the upper pivot spring? I haven't looked at my Criterium closely in a while but can't figure out how they did that, once the "locating ends", if you will, on the spring, are in their respective holes?
That won't be a problem. Play with one. You'll figure it out.
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