Surly makes the Dingle cog... I have a 17/19 dingle paired with a white ind dos eno 17/19 on a flip/flop hub. Surly may have since discontinued the dingle fixed cogs but they went up to 17/21 I think. You also don’t necessarily need the WI crank... any double crank could achieve the same thing with properly chosen rings... you just need to also find the right chain line and bottom bracket spindle width. Never used an ENO hub but had previously considered it before I picked up a proper single speed frame with track ends.
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