The 2017 KTM 300 XC, like many other dirt bikes, uses a chain drive system for power transmission. The specific chain type used on the 2017 KTM 300 XC is an O-ring chain. O-ring chains are designed to provide better lubrication and reduce friction compared to standard chains. They have rubber O-rings between the chain links, which help retain lubrication and keep dirt and debris out, resulting in improved durability and longer chain life.