BDL now offers Gates carbon X3N material for its rear belts. The same brand used by Harley-Davidson since 1980 due to its reliability. Teeth on the belt have a slick surface that is easy on pulleys. Outer surface of the Gates belt is ribbed to help with flexibility. Higher reliability due to increased length stability and better pitch. Higher resistance to humidity. Higher tensile strength and robust construction. Made in the U.S.A..