BRP - 15mm Handle Bar Risers for rubber mount kits15mm Dirt Bike Handle Bar Risers Billet Racing Products 15mm dirt bike handle bar risers are designed to work with our rubber SUB mounted applications to raise the height on oversized handlebars, achieving better ergonomics and a more comfortable riding position for taller riders when the height of the SUB mount isn't quite enough. Because our handlebar risers have an identical shape and contour to all BRP rubber SUB mount handlebar perches and the