more than 10 years before, a man get a custom 1/18 detla which look like a 1/12, use 380 motor but faster, I don't rather remember wrong, he is the man teach me use brush a thin layer silcone gule on spong tires to extend the life. After later, I purchase some parma 1/24 tires from hobby house also come with factor silcone layer too. work great too..