Z-Ring Chains Feature patented Z44 rings, which greatly improve performance and wear, making the previous X-RING and Z-Ring chains obsolete. 50% reduction in friction compared to traditional O-Rings. Constant high temperature lubrication from special grease in critical pin/bushing area provides long service life. Carbon alloy pins to minimize wear and increased roller thickness to prolong durability. Thicker outer chainrings and quad-riveting for greater tensile strength. Original Equipment on Aprilia RSV4, BMW S100RR, Ducati Panigale 1199, KTM RC8 and many others. Ideal for Street Bikes and Superbikes up to 1300cc. Gold Color.