Search new + high quality used 275 40 R21 Continental tires online, starting at: $43.31. 275 40R21 Continental models in stock: 6. All season: 32. Winter: 3. Summer: 20. Run flat: 20. 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!