Search new + high quality used tires online. Size 255 40 R21 starting at: $39.69. Tires in stock: 192. Available brands: 8 with 26 models. All season: 37. Winter: 14. Summer: 141. 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!