Search new + high quality used tires online. Size 235 50 ZR18 starting at: $49.9. Tires in stock: 146. Available brands: 37 with 54 models. All season: 132. Summer: 14.. 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!