Premature cracking and leaks in Chinese-made tire valve stems, the cause of at least one fatal crash and many other tire failures, led Safety Research & Strategies and Orlando attorney Richard Newsome to alert the public to the problem in June 2008.  Press Release

2008 Article: Ohio Importer Recalls Six Million Chinese Tire Stem Valves
As NHTSA Opens Probe into 30 Million More

Defective valve stems from China are also showing up on 2007, and potentially 2008 model year Ford Motor Company vehicles.  Safety Research & Strategies requests NHTSA investigate.