Search new + high quality used 225 40 R18 Kumho tires online, starting at: $55.19. 225 40R18 Kumho models in stock: 14. All season: 40. Winter: 3. Summer: 5.. Selling all used tires at discount costs. All used tires go through 2 layers of inspection on specialized equipment. One year warranty + free shipping on all inventory ;) Happy shopping!