Pro Circuit Linkage Arm Needs repair. There is a slight groove and a crack. Imperfections are shown in the pictures. - Pro Circuit's linkage arms are designed to stiffen up the initial linkage curve and improve the geometry of the chassis, making the bike much more stable. This will also help eliminate the initial loose and wallowy feel. Turning and cornering capabilities are greatly improved as well. - Stock length for the Crf450r (2009-2010, 2016) and Crf250r (2010) is 144 mm - Pro Circuit length is 146 mm Came off of a 2009 Crf450r (see last picture). I believe this will fit the models listed below but please do your own research and confirm fitment before purchasing. Thanks! 2010-2011 Honda Crf250r 2014-2017 Honda Crf250r 2009-2010 Honda Crf450r 2016 Honda Crf450r