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Small track cog concept for 12 and 9 tooth — image 1
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Small track cog concept for 12 and 9 tooth

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The idea is to use a regular iso disk brake mount for a fixie. I like to use a front hub. I 3d printed to check fit.

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This is an idea I had in my head for a while. I was inspired by the old PFIX hub design. This is a basically a simplified version of that idea where you use a disk brake hub to mount a fixed cog. A 3d printed version will obviously not work on a real bike and you would need to have it machined out of steel to actually work.  In practice you would probably start with a 100mm wide front hub, replace the 10mm axle to something around 180mm long and respace to 120. you would choose the spacers to ensure proper chainline. 

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