Search new + high quality used tires online. Size 315 30 R21 starting at: $29.05. Tires in stock: 254. Available brands: 4 with 23 models. All season: 50. Winter: 23. Summer: 181.. 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!