What is the name of the hubs used on recumbent tadpole trikes. Those tricycles that have two front wheels and a conventional rear wheel
They are often referred to as just that, a tadpole trike hub assuming you're looking for the front hub. They differ from standard trike hubs slightly. If you are in the united states or Canada you can get on of these from a shop. Let me know what country you are in as you are unregistered and I will do my best to answer.
Some DIYers repurpose pedal axles, e.g. starting at around 3:24 / 11:26 of Tinny's busy day - YouTube
Some pedals use the same bearings as front hubs; main challenges will be:
- threading/securing pedal axles into tadpole uprights.
- sorting pedals and hubs with compatible bearings and widths
- disassembling pedal and hub assemblies
- reassembly, replacing hub axles with pedal axles.