Search new + high quality used tires online. Size 235 50 ZR18 starting at: $48.72. Tires in stock: 87. Available brands: 28 with 43 models. All season: 81. Summer: 6.. 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!