Search new + high quality used 275 40 R21 Continental tires online, starting at: $47.99. 275 40R21 Continental models in stock: 5. All season: 24. Winter: 3. Summer: 9. Run flat: 9. 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!