For those of you looking at the one on wheels with the crank pump, be cautious. It is a bit expensive (I guess that is relative), but I used to work at a go kart track and they used those. The internals of the pump were not made very well and it leaked, or would lose pressure and you would have to crank it a million times to make gas flow. Granted, we were probably using them a lot more than they would be used for recreational purposes. my .02
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