Trek Bicycle Corp. of Waterloo is voluntarily recalling about 49,000 girls bicycles because the bike frames may break while in use. Trek has received 13 reports of frames breaking, including four minor injuries, the U.S. Consumer Product Safety Commission.

The recalled product is the Trek MT220 girls bicycles model years 2005, 2006 and 2007. The model name is printed on the frame of the bicycle. Model year 2008 bicycles are not included in the recall.

The bikes, manufactured in China and Taiwan, were sold for about $300 at authorized Trek dealers nationwide from April 2004 through June 2007.

Consumers can return the bike to a Trek dealer for a free replacement MT220 girls bicycle or a $100 discount on a different size Trek bicycle. For more information, contact Trek at (800) 373-4594.