Sram's PowerChain II Series represents a new standard in SRAM Chains, The Powerchian ii platform combines bulged outer plates with new smoother shifting inner plate design and the strength of Sram's exclusive PowerLink.
Sram have also increased the chains puch pin power over there older series chains.
The PC-971 uses nickel-plated outer and gray inner plates. As with all Power Chain II chains, Sram have made some minor changes to further enhance their shifting performance with Truvativ Chainrings.