Search new + high quality used tires online. Size 255 40 R21 starting at: $40.18. Tires in stock: 290. Available brands: 12 with 45 models. All season: 97. Winter: 22. Summer: 171.. 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!