Pro Taper Contour Windham/RM Mid Handlebars - Platinum In 1991, Pro Taper introduced the 1-1/8-inch Taperwall handlebar and the industry hasn't been the same since. The Corona, CA based company expanded its product line to include clutches, sprockets and grips, among others, but Pro Taper never turned its back on what landed them in the motocross world.The Pro Taper Contour Handlebar - Oversized is a best seller and Color: Platinum. Width (A): 800 mm. Height (B): 99 mm.