Sram xx1 hollowpin 11 speed chain a chain is just a chain right wrong designed to work harmoniously with the sram xx1 chainrings the nex 1x11 xx1 specific chain is constructed to interlink with each tooth perfectly sram xx1 hollowpin 11 speed chain features x sync a wide tooth narrow tooth pattern is repeated around the pulley wheel perfectly mirroring the chains inner and outer links for maximum control sram xx1 hollowpin 11 speed chain specifications precise and dependable 11 spee