Extremely strong. Incredibly precise. SRAM's PC-850 PowerChain II increases front and load shifting performance without sacrificing rear shifting precision. The Step2(TM) riveting process increases the Push Pin Power for optimal strength and durability.Step2-riveting process increases the Push Pin Power for increased strength and durabilityStep-riveted pins for strong side plate retentionAn equally smooth operator on city bike paths and country trailsPowerLink(R) "no weak link" technology lets you insert press and lock to join links without the need for tools