Ohio-based distributor says valves are n't working properly , could cause accidents . Tech International estimates that just 8,600 of 6 million are defective . The samples were shipped to China , and , in March , Baolong concluded that some valves could be defective . `` The cause of the defect is likely improper mixing of the rubber compound in the manufacturer 's facility , '' Tech International wrote in a letter to the transportation safety authority . Comment: Continuing to drive on underinflated tires can cause them to burst .
Ohio-based distributor says valves are n't working properly , could cause accidents . Tech International estimates that just 8,600 of 6 million are defective . Comment: Continuing to drive on underinflated tires can cause them to burst .