A worker checks a Kumho tire in a workshop in Haidian district in Beijing on April 14, 2011. The Kumho Tire company is to recall part of its tire production between 2008 and 2011 starting from April 15 due to a problem with the raw materials. A six-month free check service on the problematic tires is to be launched including 41 authorized check sites in Beijing. [Photo/Xinhua]