We got a cube 18 inch wheeler to replace a 16 inch Isla bike. Not many people make 18 inch but 20 was far too big. The difference from 16 is huge, he’s much faster now! I don’t like the plastic chain guard thing but it serves a purpose.
We also got a toweeze tow rope which we used last night on our off road gravel/ rocky climb home from school. So far it seems good though expensive!