As a good rule, when ever you start updating your drivetrain or building a new one never use an old chain. Old chains are the ghost in the machine. Recently I bought a brand new crankset and and picked up this chain as well. You could spend the extra money on the lighter 991, but you will be giving away some valuable strength. The 971 is the perfect choice for your SRAM drivetrain, strength, function and price are at there best with this chain.