Search new + high quality used 235 50 R18 Continental tires online, starting at: $52.69. 235 50R18 Continental models in stock: 18. All season: 24. Winter: 2. Summer: 8. Run flat: 3. 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!