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Simplex braze on FD clamp - need French help!

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Simplex braze on FD clamp - need French help!

Old 03-20-18, 04:11 PM
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indycycling
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Simplex braze on FD clamp - need French help!

I have this Simplex front derailleur that I want to install on my Peugeot PR10 project that has a 28.6 OD Reynolds seat tube.

It's a braze on FD and the frame does not have braze on mounts. This FD doesn't work with the typical braze on adapters readily available. Looking for input on what I need here from the experts, thanks!
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Old 03-20-18, 04:39 PM
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Originally Posted by indycycling View Post
I have this Simplex front derailleur that I want to install on my Peugeot PR10 project that has a 28.6 OD Reynolds seat tube.

It's a braze on FD and the frame does not have braze on mounts. This FD doesn't work with the typical braze on adapters readily available. Looking for input on what I need here from the experts, thanks!
That type of derailleur uses a single threaded water bottle boss-type mount on the side of the seat tube as seen here:
https://www.flickr.com/photos/jhvu/8532767303
If your frame doesn't have one, you can either have a Riv-nut installed or have a boss brazed on, which of course will ruin the paint. If I were you I'd find a clamp-on derailleur and sell that one to someone who needs it. I have never seen a clamp-type adapter for that kind of derailleur.

By the way, what year of PR-10 do you have? I would be rather surprised to see one without metric tubing.
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Old 03-20-18, 04:44 PM
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Originally Posted by Ghrumpy View Post
That type of derailleur uses a single threaded water bottle boss-type mount on the side of the seat tube as seen here:
https://www.flickr.com/photos/jhvu/8532767303
If your frame doesn't have one, you can either have a Riv-nut installed or have a boss brazed on, which of course will ruin the paint. If I were you I'd find a clamp-on derailleur and sell that one to someone who needs it. I have never seen a clamp-type adapter for that kind of derailleur.

By the way, what year of PR-10 do you have? I would be rather surprised to see one without metric tubing.
Thanks so much for the reply!

Agree, I need a Simplex Prestige or Criterium style derailleur with a built in clamp for my '71 PR10 project bike.

What do you mean by metric tubing? I was guessing by putting a metric tape measure behind my seat post and it was somewhere between 28-29mm wide. Thanks again!
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Old 03-20-18, 04:52 PM
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Originally Posted by indycycling View Post
Thanks so much for the reply!

Agree, I need a Simplex Prestige or Criterium style derailleur with a built in clamp for my '71 PR10 project bike.

What do you mean by metric tubing? I was guessing by putting a metric tape measure behind my seat post and it was somewhere between 28-29mm wide. Thanks again!
Metric tubing diameters are a 28.0mm DT and ST and a 26.0mm TT.
Imperial (inch) tubing diameters are a 1⅛" (28.6mm) DT and ST and a 1" (25.4mm) TT.

It's probably not enough of a difference to accurately assess with a tape measure. You will need a caliper of some sort.
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Old 03-20-18, 07:03 PM
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You need a different Simplex FD with a clamp mount on it......
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Old 03-20-18, 07:06 PM
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Originally Posted by Ghrumpy View Post
Metric tubing diameters are a 28.0mm DT and ST and a 26.0mm TT.
Imperial (inch) tubing diameters are a 1⅛" (28.6mm) DT and ST and a 1" (25.4mm) TT.

It's probably not enough of a difference to accurately assess with a tape measure. You will need a caliper of some sort.
Thanks so much for clarifying. It measured out IMO with my tape at 28mm the first time, but then saw all the 28.6 clamps and second guessed.

I have a member here supposed to be sending a proper FD with a clamp that should work and will save this one for the right bike especially since it's so nice!
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Old 04-01-18, 03:07 PM
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Found the front and rear I needed, all set, thanks!
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Old 04-01-18, 03:13 PM
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Originally Posted by indycycling View Post
Found the front and rear I needed, all set, thanks!
Do not be surprised if you need a shim for the front derailleur. You can make one from aluminum foil. I had a PR 10 and the original FD needed a shim.
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Old 04-01-18, 03:17 PM
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Originally Posted by Steve Whitlatch View Post
Do not be surprised if you need a shim for the front derailleur. You can make one from aluminum foil. I had a PR 10 and the original FD needed a shim.
Fits perfect without a shim. Some pics coming next, thanks!
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