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About 27,000 Trek 2012 FX and District bicycles from Trek Bicycle Corporation, of Waterloo, Wisc.

The bolt that secures the seat saddle clamp to the seat post can break posing a fall hazard.

Trek has received four reports of incidents with one injury involving a broken tooth and lip injury.

The bikes were sold at Specialty bicycle retailers nationwide between May 2011 and September 2011 for between $550 and $1,100 and include the following models: Model Year 2012: Trek 7.2 FX, 7.3 FX, 7.4 FX, AND 7.5 FX; District, and 9th District bicycle models: WSD, Livestrong and Disc models. The model name is found on the bicycle's frame.

Consumers can determine the model year by looking at the SKU number stamped on the bottom bracket, which is found near the pedals. If the last two digits of the SKU are 12, the bicycle is a Model Year 2012 bicycle.

Consumers should stop riding the bicycles immediately and contact an authorized Trek dealer for a free replacement bolt at 800-373-4594 between 8:00 a.m. and 6:00 p.m. CT Monday through Friday or visit the company's website at www.trekbikes.com

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