Search new + high quality used tires online. Size 255 40 R21 starting at: $44.37. Tires in stock: 292. Available brands: 12 with 41 models. All season: 92. Winter: 27. Summer: 173.. 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!