Are the wheels slipping or is the motor not powerful enough? If its just slipping have you tried cleaning the tires and also the sloped road track? My suggestion would be to first try taking a rag with some rubbing alcohol to clean the rubber tire. Then take the track slopes and clean them with soap and water. You can still find new tire sets but they are expensive for what you get as I think they are no longer made but can be found on the Japan Auctions. Another option is buying cheap used vehicles and rob them of their tires
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