Bike Forums

Bike Forums (https://www.bikeforums.net/forum.php)
-   Classic & Vintage (https://www.bikeforums.net/classic-vintage/)
-   -   PX-10 Simplex hanger problem, now with pictures (https://www.bikeforums.net/classic-vintage/702249-px-10-simplex-hanger-problem-now-pictures.html)

jonwvara 12-20-10 07:58 AM

PX-10 Simplex hanger problem, now with pictures
 
4 Attachment(s)
This issue has been mentioned on a couple of different threads, but I'm starting another one since I now have photos. I'm fixing a PX-10 for a friend that has a partially butchered Simplex hanger. The old Simplex derailleur was busted (merde!) so the guy at the LBS took an electric drill and a 15/32 bit and bored out the original hole so he could insert one of those threaded "dropout savers." Then he bolted on a Shimano Tourney derailleur--the ugliest derailleur ever made, it looks like to me. Not sure why that worked on the Simplex hanger, but it did. I can't stand to leave it there, though--it's too hideous.

Here's my main question: Can I install a new dropout saver (the old one was so tight I wrecked it trying to get it out) and then install a Simplex RD in the 10 mm (threaded) mounting hole? It seems to me that that SHOULD work, but I've never actually seen an intact Simplex hanger before, and I have my doubts about this one. As you can see in the photos, the crudely drilled hole is not at all centered in the dropout, but is offset by a couple of millimeters toward the back. Was the original hole supposed to be centered, and the off-centeredness is a result of the butchery? If so, is that amount of non-centeredness likely to matter?

My plan had originally been to use a Huret Duopar RD with a mounting claw--I have one set up for the Huret-style mount--which I think can be installed without further violence to the integral Simplex hanger. The problem is the frame looks awful with both an integral hanger and a claw. I'm very reluctant cut off the integral hanger, though. (Although as I admitted to miamijim, I almost wish the LBS had cut it off, because it would make everything easier. And if it had happened before the bike came to me, it would be on someone else's conscience, not mine.)

But they didn't, so the hanger stays, which means going back to Simplex. Since this is a "geezerizing" project, I need a long-cage version. That would be what, an SX410GT or SX610GT? Does anyone have one that they'd be willing to part with, for cash or some sort of trade? Either of those derailleurs will handle a 34-tooth large cog, yes?

Grand Bois 12-20-10 08:20 AM

The hole was centered, but the back of the hanger has been reshaped. Do I see a stop? It's hard to tell with that busy background. If there is a stop in the correct place you can use most any derailer.

In my experience, Simplex long cage derailers suck. With the exception of Huret Duopar, most all long cage derailers sucked except for Suntour until their patent on the slant parallelogram expired.

jonwvara 12-20-10 08:27 AM


Originally Posted by Grand Bois (Post 11958093)
The hole was centered, but the back of the hanger has been reshaped. Do I see a stop? It's hard to tell with that busy background. If there is a stop in the correct place you can use most any derailer.

You're right, it's a bad picture with a lot of glare. But the outside of the hanger has not been filed or altered. There's no stop, and the chrome is untouched. The only issue is the big hole, which as you can see is clearly off-center.

Maybe the Duopar with the hanger is the way to go after all.

Grand Bois 12-20-10 10:11 AM

I think you may be right. I think the Duopar is hideous, but they say they work well. At least you'll be keeping it French.

I'd like to try polishing the titanium version.

Kimmo 12-20-10 10:43 AM

I'd be tempted to make a stop and threads out of braze.

MalcolmsFrejus 12-20-10 11:03 AM

That really is the ugliest derailler ever made.
And I've got a TY-15 and a Positron II in the stash somewhere.......
I remember reading in a Cyclo-Pedia Catalog scan where it was suggested you saw off the hanger and use the claw. Can't find it now but it was mentioned that you leave enough metal after sawing to shape the drop out with a file to match the other side.

JohnDThompson 12-20-10 01:03 PM


Originally Posted by jonwvara (Post 11958124)
You're right, it's a bad picture with a lot of glare. But the outside of the hanger has not been filed or altered. There's no stop, and the chrome is untouched. The only issue is the big hole, which as you can see is clearly off-center.

Maybe the Duopar with the hanger is the way to go after all.

The off-center hole is not a functional concern. Simplex derailleurs were designed to use a 9mm unthreaded hole; a 10mm threaded hole is not a problem.

If you have problems with the lack of a stop tab on the dropout, you can always tighten the mounting bolt securely in the proper position so the derailleur can't rotate out of position.

N.B. This does make wheel changes more difficult since you will likely need to loosen the mounting bolt to remove the rear wheel, but how often do you really do that? Just make sure you carry the proper wrench with you in case you flat.

jonwvara 12-20-10 02:46 PM


Originally Posted by Grand Bois (Post 11958527)
I think you may be right. I think the Duopar is hideous, but they say they work well. At least you'll be keeping it French.

Duopars DO work really well--I've got one on my TdF. It shifts perfectly onto and off of the 14-38 Suntour freewheel I use with it. Cover your eyes.


All times are GMT -6. The time now is 12:18 PM.


Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.