pstock

I have a lovely old Peugeot Super Competition (probably early 80s?) which someone "upgraded" to a Tiagra 8s rear derailleur (presumably to get bigger range in the rear cluster for hills.)

All the bits on it -- SImplex derailleurs, stem, cranks, etc. -- are branded "Peugeot" except the RD.
So I searched around for a matching RD.

I thought I had found one but when I tried to install it this afternoon, on removing the derailleur tab bit (evidently this was originally on a bike without integrated derailleur tab.) I found the bolt is not the same diameter as the frame and -- I've never seen this on a traditional derailleur -- the bolt is spring loaded.

Is this Peugeot RD just incompatible and I should continue my search?
Or, is there a way to make it work?

THanks

Peter

miamijim

That particular simplex is held in place with a pinch bolt from the backside...you'll need the 'stop plate' (i just made up that word) as well. My advice to find a Simplex that's bolt-on ready or stay with the Shimano.

Scroll down to 'derailleurs'.... https://cyclespeugeot.com/Threading.html

Chombi

You might have to find a Simplex SLJ5500 for that bike to be most period correct. They are almost as pricey as the SLJ6600 (can be up to $200ish, NOS, on a good day for the seller). You might acutally get a slight price break if you find a SLJ5500 with a "Peugeot" lable on it, as most people looking for them would want the "Simplex" or "Spidel" brand on it so it can be used on other French bikes. The next model down, the 4400(?) will also work. It's different from the 5500 in a few details (maybe some plastic at the arms covered with chromed sheet steel?), but it will work pretty much identically to the higher model one.

Good luck!, hope you find it soon enough!

Chombi

iluvnoise

It looks like you have a 1981 PXN10: https://www.cyclespeugeot.com/images/1981_PXN10.jpg

If that is what you have, it originally came with an SX410.

If I were you, I wouldn't worry too much about making it period accurate. I would probably just take the derailleur you found and try to find the appropriate part to make it work from another Simplex derailleur, preferably one that is broken. Someone on the forum might even have one to send or sell to you. If you could take a picture of the back of the Simplex derailleur you bought and post it, it might help.

Grand Bois

A Simplex Super LJ would not be correct for the the bike, but it's a much better derailer than an SX410. No Simplex ever made will shift as well as that Shimano. It's old technology. Miami Jim is right about the "stop plate" and pinch bolt. You will also need the correct pivot bolt for direct mounting to the dropout. There was a recent thread about mounting a Simplex with good pictures of the parts.

dddd

My PXN10 came with a Suntour Sprint derailer, and after just using it for a while (with the well-oiled Retrofriction shifters, an 8-speed, 7.1mm KMC chain and a 7-speed, 12-25t Uniglide freewheel), I now wouldn't want to change a thing.

The Suntour derailer isn't original, but it unfamiliar enough in this day and age so as not to be so conspicuously current.
And the shifting is so easy as to be better than indexing, to the point that other riders occasionally comment on this. The shifting is often actually faster and quieter than on their new bikes, even during more-competitive runs up in the hills.

pstock

Can you clarify what you mean by Stop Plate?
As you can see, the one I have has a plate that attaches it to a frame lacking derailleur hanger (and there is a bolt on the back side of that.)
Is that what you mean by stop plate?

or is it the bit shown in the attached photo of the back of an SX410?

Grand Bois

Find the thread that I mentioned and look at the pictures. It will become obvious to you.

Here:

https://www.bikeforums.net/showthread...lex-ing-a-PX10

pstock

Excellent. Got it. Many thanks!

pstock

That looks like it!
many thanks

miamijim

Yes, that's what I was reffering to.....

pstock

Perfect. Indeed. Post 35 of that thread makes clear the different affixing options for Simplex derailleurs.
I think I can cobble it together from here.
End of thread.
many Thanks (again.)

harpon

I'd put a Campy Nuovo or Super Record derailleur on it. You already have the standard drilling which is libilitity with Peugeot's older than yours, who had Simplex dropouts, that aren't drilled, but use the rear bolt on method-

You are already all set to put almost any more modern shifter on.

The other parts are really nice though- especially the drilled crank!