Search new + high quality used 225 55 R18 GT Radial tires online, starting at: $36.15. 225 55R18 GT Radial models in stock: 5. All season: 12. Winter: 4. Summer: 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!