The Tikit has an URT design. Thus you can have a gear hub without derailleur, e.g., a Shimano Nexus 8 speed. As you always need some chain tensioning on the Bromptons tuck-under fold, there the best choice is the 2 speed. On the other hand, the Brompton has the Titanium option reducing the weight down to 9,5 kg. The Tikit is a good 1kg heavier. Unfortunately both these bikes have small 16" wheels and there are no 20" counterparts, bummer. For fitness or touring, I prefere 20" wheels. Also both bikes do not provide enough clearance for wider tires (Big Apples).