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 PC1031 series chains also boast hollow pin construction for weight savings with no loss of strength. Lighter weight plus smooth, positive, precise shifting adds up to true performance. Compatability extends to industry standard 10 speed systems.