No weakest link. SRAM'S new Super Narrow 10-speed Power Chain features the PowerLock connecting link the only secure toolless attachment device for a sub 6mm chain in todays market. SRAM PC1091R series chains also feature hollow pin construction and outer plates with lighting holes for weight savings with no sacrifice of strength. Lightweight, smooth, precise-shifting. A true high-performance product. Compatability extends to industry-standard 10-speed systems.