This recall involves all 2008 Redline D640 bicycles. The bicycles were sold in black and have aluminum frames. "REDLINE" is written down the frame's tube. The model number is written on the frame's top tube. Sold at: Bicycle specialty stores nationwide from December 2007 to May 2010.  Hazard: The head tube can separate from the frame, causing the rider to lose control and fall

http://www.cpsc.gov/cpscpub/prerel/prhtml11/11064.html