Search new + high quality used tires online. Size 235 50 ZR18 starting at: $42.95. Tires in stock: 96. Available brands: 31 with 45 models. All season: 92. Summer: 4.. 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!