Best advice ^ ……….. I have also inserted a tube to "stretch out" the tire.Tires on small wheels are a royal pain to take off or put on, with or without a tire changer. No matter what you use, heat is your best friend. Leave them in the sun on a hot day. Better yet, put them in a pot of boiling water and simmer for five minutes. Boiling water can’t get hotter than 212° at sea level, absent a pressure cooker. So you can’t hurt a tire doing this.