Search new + high quality used tires online. Size 325 30 R21 starting at: $94.1. Tires in stock: 20. Available brands: 4 with 8 models. All season: 3. Summer: 17.. 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!