The CZ 219 O-Ring ORS Black Box chain is an ultra-reinforced version of the RS chain, developed specifically for endurance racing and high-intensity applications. Featuring CZ's proprietary O-Ring technology, this chain offers exceptional durability, reduced wear, and lower maintenance requirements. The O-Ring design helps to retain lubrication, significantly reducing chain stretch and increasing its lifespan compared to the standard RS chain. This makes it perfect for longer races, such as endurance events and championships, where reliability is crucial. While it has slightly more friction than the RS version, the trade-off in durability makes it the ideal choice for drivers prioritising longevity over minimal resistance. Like the RS version, the Black Box ORS chain is a multiple .
