I have an old model of Ninebot with solid wheels (tires).
Zero service, but little traction on gravel, coarse sand, and be careful on wet surfaces.
With front powered wheel, higher tire wear than rear tire.
Worse comfort on rough ways.
But zero service wins, no need to pump, to change blown tubes.
yea, zero maintenance is really what I'm looking for, The key issue in my mind, i don't want to think about having to replace a tire because it's a pebble is in the way that I can't steer around.
thanks, the 9bot was the other one I was looking at besides the hiboy.