SRAM PC XX1 Hollowpin 118 link 11- speed chain. OEM for the Haibike XDURO Pro, Nduro and AllMtn models from 2014. The XX1 chain comes from a long line of tough, light-weight chains from SRAM. Includes no tools required quick link for easy installation. This chain is for 11 speed only, if you require a 10 speed please see our other products.