The PC-X1 chain comes from a long line of dependable, lightweight chains that are built for toughness. Designed with SRAM’s trusted XX1 geometry, the PC-X1 features solid pin construction, 11-speed Power Lock™ & smooth, efficient shifting that you can count on every time out. Power Lock&174; SRAM chain engineers developed Power Lock as a tool free, sure & consistent way to connect our 11 speed chains. While PL does not require special tools for install, the especially tight tolerances of 11 Speed drive trains mandated that each Power Lock is good for a one-time application only. X-SYNC™ SRAM X-SYNC™ 1X chain rings provide the highest level of performance & durability. The SRAM X-SYNC™ tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp & narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC™ chain rings have been designed with mud-clearing recesses for the inner chain links & rollers. Engineered in Germany, X-SYNC™ rings are an integral part of the SRAM 1X™ drivetrain.