I've only done the three wheeled one, and that is a never again. It's like training wheels. You can't lean in a turn. Besides that, the steering was weird becau

I've only done the three wheeled one, and that is a never again. It's like training wheels. You can't lean in a turn. Besides that, the steering was weird because there wasn't an axle, instead the entire middle of the frame was articulated. That thing was a slightly faster and more ergonomic wheelbarrow, not a bike.