This sounds kinda serious ...
The U.S. Consumer Product Safety Commission, in cooperation with Seattle Bike Supply, has issued a voluntary recall of about 200 Redline D640 bikes.
The head tube can separate from the frame, causing the rider to lose control and fall. This poses a risk of serious injury. SBS is aware of eight reports of head tubes separating from the frame, including four reports of minor scrapes and cuts.
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.
Consumers should immediately stop using the recalled bicycles and contact a local Redline bicycle dealer to receive a free frame replacement.