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As far as I can tell, absolutely fine. Think about the forces acting across the HG body compared to when it's holding a cassette - arguably SS puts less strain on the HG body than gears as the force only stays in one plane...but I'm definitely not a mechanical engineer and I'm sure that something something wheel stiffness with a wider-dished SS-specific hub.
Another plus of a conversion kit is that you can fine tune chainline.
any recommendations for rear ss disc hubs?
or is it 'fine' to just use an hg cassette rear wheel with a single speed kit like a gusset 1-er?