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The original rules from last year said you had to use the actual PowerWheels wheels. Everyone had such trouble making them work, that they changed that last year before any of the races started. Those plastic wheels just aren't designed to connect to anything other than the custom plastic gearboxes those vehicles have.
We still aren't allowed go-cart racing slicks, but anything else is pretty fair game. There were a lot of riding lawn mower wheels, and off-the-shelf industrial wheels of various types, wheelbarrow wheels, whatever!
They also DID allow for up to a 36V battery system this year, but not too many people ran it. There's just so little room in these vehicles that space and weight are very limiting.
On DC motors, more volts means a higher top speed, but we were really already going as fast as you could want in one of these!
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