Complete chain kit with increased gear ratio. Front sprocket: 15t Rear aluminum sprocket: 60t Chain: DID 525 VX (reinforced X-ring, gold) The chain length is adjusted to the size of the sprockets. Always check the correct length before connecting the chain. APPLICATON: The 15/60 ratio drive is the most-sold drive on motorcycles with a 600 ccm capacity. It shouldn't be a surprise, as it's a universal drive. It lets the user to both stunt ride (do circle wheelies etc.) and ride home from the stunt spot without any major problems. Recommended product!