HI, be careful making the tires too "grippy". the gearboxes will strip easily if the wheels dont spin freely at least some while getting moving,
I was wondering the same thing, can't find any rubber replacements and came up with a solution- use a rubberized undercoating for automobiles. It sprays on thick and provides more grip than the plastic wheels do.
There is more info on modifications here:
http://kidsbatteryrideontoys.com/gearheads-only/
Copy and paste and should have the info you need-
http://www.kidswheels.com/index.php?option=com_content&task=view&id=5&Itemid=33
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