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I wish to build a tricycle and one of the limiting factors is getting the front hubs. I search for tricycle hubs on eBay and get nothing useful. I need both the hub and axle or the axle dimension has to be a very common easily obtained bolt size. What would I search for?

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I think wheel chair hubs are what you are looking for. If you need disk brakes, Cannondale Lefty hubs are another off the shelf solution.

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