Search new + high quality used 245 40 R18 Firestone tires online, starting at: $62.61. 245 40R18 Firestone models in stock: 4. All season: 6. Summer: 1. 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!