Sram: NO WEAKEST LINKExtremely 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.THINGS TO REMEMBER• Faster, more accurate shifting at a more affordable price pointFEATURES AND BENEFITS• Employs PC-991 inner and outer plate designs paired with nickel-plated outer and grey inner plates