The contact owns a 2003 Freightliner Century CST120 equipped with Yokohama Tires, Tire Line: TY517MC2, Tire Size: 295/75/R22, DOT Number: N/A. The contact stated that the tires had cracked on the sidewalls. The contact called a tire center which scheduled an appointment. The tires were not yet inspected. The manufacturer was contacted. The vehicle failure mileage was 200,000. The tire failure mileage was unknown.