The economic option of the ENDURO/ADVENTURE series chains uses a technically simpler ring with a round profile to make the lubricant sealed that imparts its name to the entire sub-category of the chains – O-ring. Despite the use of the O-rings can’t achieve the sealing properties of the Active-rings, the sealing is sufficient for normal operation with adequate lifecycle of the chain transmission.

The chains of the O-ring category are selected by the motorcycle users who look for economy of the motorcycle’s operation without high annual mileage.520 ORM: Massive popularity and quality of the chain proved by years made this chain the legend offered by ČZ. Ideal for road and hard enduro motorcycles with great durability despite the chain is being sealed with O-rings only. It may be used for less powerful road motorcycles as well.