Search new + high quality used tires online. Size 235 50 ZR18 starting at: $57.57. Tires in stock: 73. Available brands: 25 with 39 models. All season: 68. 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!