Answer pro taper sl 720 carbon riser barits a simple concept a handlebar should be the strongest where its stressed the most protaper handlebars have a variable wall diameter that is thickest at the clamp area and tapers toward the ends of the bar the result is a bar with the best combination of strength light weight and stiffness featuresone piece carbon lay up for consistent wall thickness145mm grip grit finish at the end of the barsclamp dia 31 8mmrise 13mm and 25mmwidth 28 3 7