Used by team Honda Pro racers; This stabilizer is extremely adjustable and rugged. The unit comes with all hardware needed for an easy installation and mounts up to your 450R in approximately 15 minutes; no drilling, welding, or grinding needed. The new Precision ELITE Model has a built in reservoir, wider and more linear adjustment range, and larger wear surfaces for even greater product longevity. Plus up to 65% better impact damping than previous models. The stock steering stem diameter for the TRX450 is 1.35 dia. If your aftermarket stem has a different then stock please choose the correct diameter from the pull-down list bellow.