Search new + high quality used 235 50 R18 Continental tires online, starting at: $42.44. 235 50R18 Continental models in stock: 20. All season: 62. Summer: 10. Run flat: 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!