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Now I'm with ya, I see how that could be a pain. Fairplay then, less than ideal but worth a shot purely for the crack (pun unintended). As for the caliper adapter I'm sure there are better alternatives out there, but this is literally an experiment just for fun. My thinking is to use the rear only as a backup to make the single speed safer. The abuse the bike has/will receive will outweigh the stress of the braking force anyway lol.
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One of these would probably work a lot better.
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I think what will happen is you'll get it set up and it will work for the first few kms and then after the first few bits of radness the rear brake will start rubbing. It will probably stay in place and not really slow you down, but you'll be able to hear and feel the rotor against the pad. After a few more kms the noise and rubbing will drive you mental. And for the next part I would caution against SS and front brake only, it's amazing how much even unconsciously a person uses their legs to slow down on fixed. So I say make it fixed, no rear brake and nice front brake.
Of course who knows, maybe it will work great!
The wheel moving accidentally is not the problem, it's when you want to adjust the chain tension or remove the wheel to fix a puncture then have to put it all back together again and get it all in the right place.
The adapter will fit the threads fine. Presuming you buy the right one, the one I have fits freewheel threads fine.
That caliper adapter though...>>>>>>>>>>>>>>>>>>>>>>>>