Search new + high quality used tires online. Size 285 40 R21 starting at: $72.3. Tires in stock: 71. Available brands: 11 with 21 models. All season: 58. Winter: 2. Summer: 11.. 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!