Huh? The surly fixed hub is working perfectly fine so far with the freewheel cog, unless that's not a good idea?
Isn't it 135mm rear end? Just use any mtb single speed rear end. Hope do a nice one with a freehub that can fit up to 5 cogs (if you ever want to add gears). Its perfectly fine as it though.
@tallsam started
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Huh? The surly fixed hub is working perfectly fine so far with the freewheel cog, unless that's not a good idea?