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PX-10 RD Hanger Tap size

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PX-10 RD Hanger Tap size

Old 01-21-18, 04:22 PM
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r0ckh0und 
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PX-10 RD Hanger Tap size

I've finally come up with a build plan for my PX-10. So as I'm mocking things up a bit, I find that the RD Hanger has never been tapped. Frame is in excellent condition and so apparently never built up.

Is a 10mm tap appropriate for this frame?
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Old 01-21-18, 07:02 PM
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Older Simplex dropouts were not tapped because Simplex derailleurs don't need a threaded hanger. 10mm x 1.0mm is the standard thread for derailleur hangers, but if you intend to mount a non-Simplex derailleur you'll likely need to file a stop on the tab as well or make some other accommodation. From our own @jonwvara:

Derailleur Hangers Demystified - Red Clover Components
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Old 01-21-18, 09:23 PM
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Good stuff........good article. Thank you both

Back to plan A, I suppose.
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Old 01-22-18, 12:40 AM
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NOS frame, I'd go the claw over hanger approach, or find a Simplex RD.
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Old 01-22-18, 01:22 AM
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Originally Posted by jyl View Post
NOS frame, I'd go the claw over hanger approach, or find a Simplex RD.

Yes, I have most everything but the FD/RD. Not NOS, Frame does show some signs of being built previously. I'd like to hold out for the right parts as opposed to modifying the hanger or using a claw.
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Old 01-22-18, 02:13 AM
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Of course, I've heard that Campagnolo used 10mm x 26tpi...

If only you could find the right tap
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Old 01-22-18, 07:45 AM
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You've likely seen this but this is a good resource when thinking about building up a bike with simplex drop outs

Derailleur Hangers Demystified - Red Clover Components

I was sorely tempted to run a shimano crane on my PR 10 that I built up last summer but the purists here scoffed at the idea. I ended up finding a long cage simplex at a reasonable price on eBay.

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Old 01-22-18, 08:40 AM
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A lot of people see nothing wrong with filing a Simplex hanger to accept a Campagnolo-type derailleur, but I think it's kind of a shame to do that. I have settled on the approach of just paying what I need to pay in order to come up with a Simplex derailleur that will do what I need it to do. Long-cage Simplex RDs aren't super common, but they're out there. That's by far the cleanest solution, in my opinion.
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Old 01-22-18, 09:44 AM
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Originally Posted by bikemig View Post

I was sorely tempted to run a shimano crane on my PR 10 that I built up last summer but the purists here scoffed at the idea.
I was saved the public ridicule on the PX10 that I'm currently building. I bought it already tapped, with the Crane installed... I'm actually pretty happy about that: In my scheming mind it gives me license to apply all sorts of unoriginal touches.
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Old 01-22-18, 12:48 PM
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This frame is to clean. ...don't have the heart to modify it
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Old 01-22-18, 05:07 PM
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No way I'd tap that. There are 2 many nice all metal Simplex RD and FD around still
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Old 01-22-18, 05:13 PM
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My take on modding frames is this:

If the frame is in really nice condition, I feel bad about messing with a nice, high quality, vintage frame with good paint and/or chrome. The ones that are skin ugly but have good bones, those I'll torch up and repaint however I want.
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Old 01-22-18, 06:14 PM
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Originally Posted by bikemig View Post
I was sorely tempted to run a shimano crane on my PR 10 that I built up last summer but the purists here scoffed at the idea.
It probably wouldn't have been that out of place:

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Old 01-23-18, 08:42 AM
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When did Simplex dropouts change? I had no trouble putting a SunTour Cyclone II on my 1980 PKN-10, then switching back to the original Simplex when I gave the bike to my son. (I ran a 3x6 48-45-34 / 13-15-17-19-21-23, but changed it to a 3x7 52-45-34 / 13-15-17-19-21-23-26 for him.)
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