Renthal's R4 ATV chain is a premium strength Z-ring chain with excellent impact load resistance, designed specifically to withstand the stress found in ATV applications. The R4 chain features a heavier duty construction process and materials than our standard R3-2 O-ring chain which increases it's service life and tensile strength. The patented ?spring effect? Z-rings guarantee constant lubrication for longer life and pins manufactured from special alloy steel also contribute to better resistance from wear. Thicker side plates and a quad riveting manufacturing process round out the upgrades on this ATV specific chain.