Search new + high quality used 275 40 R21 Continental tires online, starting at: $48.55. 275 40R21 Continental models in stock: 3. All season: 3. Summer: 18. Run flat: 18. 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!