Northern Tool also has sprockets and hubs for go carts that they sell.
Make sure that the batteries are sized to handle the load, otherwise you are going to go thru batteries pretty quick, an hour of run time is almost what you want to aim for to get a slow enough discharge rate, also remember not to run your batteries dead or you will wear them out faster as well, gel batteries are a bit more forgiving but still don't like to be run dead.
If this was a 4 wheeler for an adult, I would say get lithium batteries right off, as the price of them is dropping so much it's worth it.
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