some delta trikes have a differential(had a trike with a differential) even so compared to regular bike it feels weird until you get used to it, even the geometry is weird "Ackerman" wise so you can successfully ride one, you have to understand the limitations on the handling, the "Tadpole" trikes handle quite well I am told. If you are building a trike theres a company in South America that makes trike differentials.
