About 4,000 bicycles are affected.  The recall was announced by the manufacturer, Specialized Bicycle Components Inc., of  Morgan Hill, Calif., in cooperation with the Consumer Product Safety Commission.

The model "Allez" bicycles are blue and the model "Allez Sport" bicycles are orange. These bikes were sold through authorized Specialized dealers from October 1998 through June 1999 for between $1,000 and $2,000.

Specialized said it has received one report of a consumer suffering serious injuries, including a concussion, when the handlebar pulled out of the handlebar stem.

Consumers should stop riding these bicycles immediately and take them to an authorized Specialized dealer for a free inspection and replacement of the handlebar stem if needed.

For more information, call Specialized at (800) 214-1468 between 8 a.m. and 5 p.m. PDT Monday through Friday, or go to their website at www.specialized.com.

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