Search new + high quality used tires online. Size 255 40 R21 starting at: $44.59. Tires in stock: 209. Available brands: 11 with 38 models. All season: 43. Winter: 19. Summer: 147. Run flat: 1. 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!