No weakest link. SRAM'S Power Chain features the PowerLock connecting link — the only secure toolless attachment device for a sub 6mm chain in todays market. The PC 991 Cross Step version1 features a secondary riveting process that increases the push pin strength by over 25% compared to our standard riveting. It's a combination of strength, lighter weight and our legacy of smooth, positive and precise shifting that delivers true high performance. This is our strongest chain.  This chain in new in packaging not OEM take off.