Search new + high quality used tires online. Size 225 50 ZR18 starting at: $52.34. Tires in stock: 43. Available brands: 15 with 20 models. All season: 39. 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!