Add High-Rise Style to 2015 Harley-Davidson Road Glide Models. Riders can hang ’em high with two new tall handlebars from Harley-Davidson® Genuine Motor Parts & Accessories designed specifically for the 2015 Harley-Davidson Road Glide® model motorcycles. With 12 inches of rise, the Tall Boy Handlebar is two inches higher than the Original Equipment bar. Diameter is 1.25 inches and it also accepts internal wiring for a clean look.