Search new + high quality used 315 30 R21 Pirelli tires online, starting at: $29.64. 315 30R21 Pirelli models in stock: 11. All season: 62. Winter: 21. Summer: 50.. 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!