Search new + high quality used 315 35 R21 Continental tires online, starting at: $28.73. 315 35R21 Continental models in stock: 2. All season: 39. Summer: 26. Run flat: 26. 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!