I created these fat bike adapters for my old Thule racks two years ago. I’ve since bought racks that will take a fat bike naturally, and would like to pass these on to anyone wanting to try a fat bike, or who has yet to upgrade their rack. Just some plastic sewer pipe with an end cap glued on and cut to fit. Available in Halifax area.
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Great idea!
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Thanks! It worked pretty well, though I think the inside of the pipe could be roughened up or have a little rubber coating added for more grip on the tire; but that’s likely me being a perfectionist. 
Also recommend reusable zip ties for attaching it to the rack.