The NSB 1×11 Spider replaces the removable chain ring spider so that you can run a SRAM XX1 chain ring on Truvativ X0, X9, S2210, and S1400 cranks. There are no mounting holes for the granny ring and the single ring’s position is designed to give a better chain line throughout the entire gear range. The chain ring tabs accept an optional NSB rock ring for All Mountain or Enduro riding.