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I was merely quoting the Velosolo
Their numbers are a bit off. 4mm spacing between two 2mm thick 3/32" sprockets gives 41 and 47 on a 100mm hub run centrally between dropouts. If you're using bushingless 3/32" chain, that's plenty close enough to 40/48 to be acceptable, not many frames are actually tracked so accurately that you'd even know without measuring whether you were out by 1mm on both combinations or zero and 2mm either way. I'm pretty sure all my fixei bieks are out by at least 1mm and even the ones with ridiculously inflexible 1R8 chain run fine.
gbj_tester
Hmm, I was merely quoting the Velosolo suggestion. Easy enough at the hub end but if it doesn't match at the front it sounds a bit like a faff.