Search new + high quality used tires online. Size 225 50 RF18 starting at: $51.4. Tires in stock: 51. Available brands: 1 with 4 models. All season: 51. Run flat: 51. 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!