Search new + high quality used tires online. Size 305 30 R21 starting at: $44.59. Tires in stock: 221. Available brands: 5 with 18 models. All season: 42. Winter: 4. Summer: 175.. 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!