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Pro Circuit's Linkage Arms are CNC-machined from billet aluminum and 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. Although having your suspension revalved by Pro Circuit would make a considerable improvement, the Linkage Arms alone provide a major improvement over the stock set-up.
Each link arm includes all of the required bearings and seals.
Stock Length for the CRF450R ('09-10, '16) and CRF250R (2010) is 144 mm - Pro Circuit Length is 146 mm