The answer: Born-on dates. A safety advocacy group is pushing for tire manufacturers to print (or stamp) born on dates onto all their tires in an effort to prevent accidents related to older tires. The Massachusetts-based Safety Research & Strategies Inc. sent in a request into the NHTSA to study tires as old as six years that can begin to deteriorate. Of course those in the tire industry deny the claims. The president of the Rubber Manufacturers Association says there is no research to back up the inquiry.