Definitely go for big-wheel models like this one. My 4 year old loves it and abuses it like crazy. Because it has large wheels, it can easily negotiate uneven sidewalks, sidewalk pebbles, and especially the edge of a ramp on the sidewalk (ramp-to-road transition). I don't recommend big wheels. The bar on wheels works if you put your back foot on it and lean back, my son is too scared of it. The brakes are standard Razor brakes, a piece of metal pressing against the rear wheel causing friction.
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