I settled on the Peformer JC70 trike with the 700c drive wheel. I followed the gearing rationale I came up with above, and I think it will be sound. It will be easy enough to get both the low and high gears I think I will need. Now that I've ridden it a bit, I probably could have done it with the 20" wheel too. But I'm happy with the 700c.
In my time frame without any local dealers, Performer with it's unassembled, free shipping sales modelwas really the way to go and I'm happy with it so far. But I like putting bikes together, and this had some new stuff to figure out.
Last edited by Camilo; 05-11-20 at 02:10 AM.