If you’re happy riding fixed with only a front brake then flip that wheel and use a 6 bolt cog. Chainline might need a bit of fettling.
That, or get a surly new ultra disc 135old like I did. Do need two brakes in Germany though, hence disc and cog
@Rodolfo started
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If you’re happy riding fixed with only a front brake then flip that wheel and use a 6 bolt cog. Chainline might need a bit of fettling.