This recall involves the model year 2013 Trek Madone bicycles with model numbers 5.2, 5.9, 6.2, 6.5, 7.7 or 7.9, and serial numbers starting with WTU and ending with G or H. A list of all serial numbers included in the recall is at www.trekbikes.com. Some of the recalled models are custom-ordered Project One Madones. The model number is printed on the bicycle frame. The serial number is printed on a sticker underneath the frame of the bicycle. The bicycles were sold in a variety of colors.

Consumers should immediately stop using the recalled bicycles and take the bicycles to a Trek dealer for a free replacement front brake system. 

Trek has received five reports of loose front brake attachment bolts. No injuries have been reported.

Bicycle stores nationwide from July 2012 through December 2013 for between $3,400 and $6,300, and for custom models between $4,000 and $15,000.