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custom orders
A Nexus 8 is about $250 plus the shifter and some other parts and to have a bike shop lace one in around here is about another $200. The hole count would need to be the same as the rim. Also it would require horizontal dropouts or a tensioner. It would be a waste on a little fat bike in my opinion. And to get the gearing up you would need a larger ring because of the small wheels. Never shift one of these under power. Coast & Shift.
Something like this?