Search new + high quality used 285 45 R21 Continental tires online, starting at: $29.92. 285 45R21 Continental models in stock: 7. All season: 92. Winter: 5. Summer: 8. Run flat: 36. 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!