Gates Polychain Rear Drive Belt For Harley Dyna Features This Gates belt is the same brand of belt used by Harley-Davidson since 1980 due to their reliability The teeth on the Gates belt has a very slick surface that is easy on the pulleys The outer surface of the Gates belt is ribbed to help improve flexibility Belt length is determined by measuring pulley center-to-center Replaces OEM 40015-90 Made in the USA