Search new + high quality used 275 45 R21 Michelin tires online, starting at: $27.23. 275 45R21 Michelin models in stock: 9. All season: 53. Winter: 2. Summer: 13.. 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!