710-5m-15 Belt Superceeds to htd 710-5m-16 For Older model Cobra gas scooters Where wheel sprocket is not removable, rather it is part of the wheel. . . .OR. . . . For rock or cobra with ScootR Swingarms or with 26 tooth 5m torque sprockets, ************NOTE*********** "If using 26Toothed torque sprocket And ScootR Swingarms on Cobra, then use 740-5m-16 On geared & stretched Chuweng , use 790 or 800-5m-16"