GT had identified a potential issue with the handlebars equipped on a limited number of 2017 GT Karakoram and Aggressor bikes. In certain cases, the handlebars may develop small fatigue cracks over time, which if not identified, may continue to grow larger and eventually lead to a fracture of the handlebars. If this happens, a rider could lose control of the bicycle and fall.

http://www.bikebiz.com/news/read/gt-issues-international-recall-on-certain-mtb-handlebars/021388