Search new + high quality used tires online. Size 285 40 ZR21 starting at: $63.42. Tires in stock: 28. Available brands: 6 with 8 models. All season: 17. Summer: 11.. 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!