MicroShift have new super short derailleurs for 20 inch wheels.
https://www.microshift.com/news/intr...g-super-short/
Has anyone tried these with trikes? I have a Stein Mungo with a 20 inch rear wheel and always worry about tearing off my Deore rear derailleur. The MicroShift might be a good option. I have a Schlumf mountain drive in considering fitting to the trike, so could get truly epic gear ranges.