I, unfortunately, have the crappy plastic type, so they dont inflate, they just hold up under their own structural strength. I've used inflatable ones before and they are indeed much better than the plasic ones even when one of the wheels is low on air. the problem here though is that the boat is not shifting the way it used to when I pull down the front. Usually when I pull down on the front cable stay, once I get the boat leaning forward rather than back, the wheels slip backwards a little and that puts the weight forward so I can pull the thing around. Now though, they dont slide back on their own, and even when I move them back manually, the weight is still behind the wheels.