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Mystery vintage "backwards" derailleur hanger?

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Mystery vintage "backwards" derailleur hanger?

Old 05-04-21, 08:44 AM
  #1  
chune
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Mystery vintage "backwards" derailleur hanger?

I recently purchased a NOS suntour rear derailleur for a 70s raleigh I am fixing up. It looked normal at first but the claw style derailleur hanger that came on it appears to be backwards. Other than that the derailleur looks like the other ones I have. Was there bikes that had the derailleur hanger mounted inside the rear dropouts? Or where would a hanger like this have been used?

EDIT: guess I need to post more before I can link pics
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Old 05-04-21, 08:57 AM
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Originally Posted by chune View Post
I recently purchased a NOS suntour rear derailleur for a 70s raleigh I am fixing up. It looked normal at first but the claw style derailleur hanger that came on it appears to be backwards. Other than that the derailleur looks like the other ones I have. Was there bikes that had the derailleur hanger mounted inside the rear dropouts? Or where would a hanger like this have been used?

EDIT: guess I need to post more before I can link pics
Are you sure the derailer isn’t just threaded onto the backside of the claw? This could just be an instance of the original Murphy’s Law.
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Old 05-04-21, 09:02 AM
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There are lots of frames that have the hanger mounted on the inside of the dropout, could it be that you've just never seen one?
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Old 05-04-21, 09:08 AM
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Old 05-04-21, 10:12 AM
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thanks curbtender! Yes, look at those two pictures. If you flipped the hanger around the tab would be in the wrong orientation. I'm just trying imagine what the dropouts would have to look like to be compatible with a hangar like that. Unless it was some weird left hand drive bike or something haha
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Old 05-04-21, 12:00 PM
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Could be for track ends conversion to gears?
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Old 05-04-21, 05:59 PM
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Shows hangers both directions.
SunTour parts catalog (1976)
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Old 05-04-21, 07:05 PM
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We have a couple of recent made Shimano entry level ders with the same hanger plate slot direction. IIRC they were ordered without our seeing the "BMX" notation Andy
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Old 05-04-21, 08:34 PM
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Originally Posted by flypaca View Post
Could be for track ends conversion to gears?
That is the only thing I can think of that makes sense.
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Old 05-04-21, 09:21 PM
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Originally Posted by Andrew R Stewart View Post
We have a couple of recent made Shimano entry level ders with the same hanger plate slot direction. IIRC they were ordered without our seeing the "BMX" notation Andy
​​​​​​https://www.modernbike.com/shimano-t...mx-track-frame
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Old 05-06-21, 09:44 PM
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Originally Posted by Andrew R Stewart View Post
We have a couple of recent made Shimano entry level ders with the same hanger plate slot direction. IIRC they were ordered without our seeing the "BMX" notation Andy
I used one of those to convert an early 26" wheel BMX-Cruiser to a multi-speed. Spread the rear triangle, align the fork ends, attach rear derailleur, Bob's your uncle.
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Old 05-08-21, 05:44 AM
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I have a couple of them here in Cambodia. They are useful to add derailleurs to bikes with track ends which are typically older 3 speed IGH stepthru bikes.
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