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The Shimano Dura Ace 7900 Chain provides an effortless and quiet ride. The asymmetric design leaves you with no chain worries. What exactly does "asymmetric design" mean? It means benefits, man. It also means that the inner and outer plates are in't exactly the same shape. The outer plates are shaped to reduce the possibility of chain suck while shifting between chainrings. The inner plates are shaped to match the 7900 cassette cog teeth perfectly. The ultimate effect on your ride is smoother and quieter shifting. It also boasts a no-tools-required connecting link that means no matter where you are, your Dura Ace 7900 chain is that much easier to maintain or repair. Built with an asymmetrical design Inner plates shaped to match 7900 cassette cog teeth perfectly Uses a no-tools-required connecting link