Search new + high quality used 235 40 ZR18 Kumho tires online, starting at: $57.94. 235 40ZR18 Kumho models in stock: 5. All season: 14. Summer: 2.. 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!