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• An equally smooth operator on city bike paths and country trails• PowerLink® no weak link technology lets you insert, press, and lock to join links. No tools needed