Sram pc971 9 speed chainlike the pc 991 the pc 971 features inner and outer plate designs that offer faster and more accurate shifting at a more affordable price point the pc 971 uses nickel plated outer and gray inner plates as with all power chain version 2 some minor changes were made to further enhance sram shifting performance with truvativ chainrings features compatible gears 9 closing link powerlink outer plate nickel plate inner plate grey pin treatment chrome hardened rivet