SRAM PC951 Chain 9SPD 1PC 86.2706.114.105Extremely strong. Incredibly precise. SRAM's PowerChain II increases front and load shifting performance without sacrificing rear shifting precision. The Step2 riveting process increases the Push Pin Power for increased strength and durability. Accurate shifting, excellent wear resistance, and superior durability with 9 spd compatabilty. Sram PwerChain II will help drive you every inch of every ride, with confidence and unmatched reliabilty.