Schwinn OCC StingRay 3-Speed hub

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I just picked up a 3-speed Schwinn OCC Sting Ray and would like to add a disc brake to the left (opposite the chain cog).

Since the factory 3-speed OCC choppers use rim brakes, there are no brake parts on the hub itself. Amazingly, this hub (SX-RB3) is designed for a BAND brake! While I'm sure band brakes are acceptable on pedal power when used in conjunction with a front brake, it just won't do for a motorized bike that will hopefully be capable of 35 - 40 mph.

The hub has a male threaded journal to hold the braking surface (which looks like a centrifugal clutch drum) to it. The journal measures 1.375" (35mm?) diameter with very fine thread which I assume would be clockwise.

I can't find the band brake components anywhere. Even the factory parts diagram doesn't show part numbers. I was hoping to use the drum as a starting point to mount a brake rotor.

Does anyone know of an existing threaded part that could be used to mount a disc brake rotor to the hub?
 

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Yes, if you are motorizing a Stingray you need to have a look at Pedalchopper website.. what you are looking for is a thread on disc brake adapter.
I thought of that and I measured the freewheel sprocket journal on a spare single speed OCC StingRay because I'll aware that Jim Wilson at Pedalchopper has a threaded adapter for those. It appears to be about .125" bigger in diameter. I'll contact him since he's likely experienced with this scenario.
 
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Jim Wilson from pedalchopper.com says the adapter he sells for taking the freewheel sprocket off the rear hub on a single speed OCC is the same thread but having both hubs at hand to measure with my dial calipers (Starrett brand, very accurate), I have to question that. Unless I'm measuring the wrong spot, the threaded portion of the freewheel appears to be .125" too big.
 
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The bicycledesigner.com parts should be exactly what I need. I noticed that not only are the rotor adapters out of stock, LOTS of other stuff is too. Is this common with the bicycledesigner.com website?
 
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