Search new + high quality used 275 40 ZR18 Firestone tires online, starting at: $98.1. 275 40ZR18 Firestone models in stock: 1. 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!