A woman flipping a tire at the gym ponders buying tires online. But then what? TireRack.com has already thought about that and offers the exact services the woman begins to think up, like shipping directly to a mechanic so all you have to do is make an appointment. The woman thinks her idea could change tire buying forever. The company is offering up to a $70 VISA Prepaid card when you purchase a select set of four General Tires for a limited time.