Run smaller chainrings on your SRAM and Truvativ cranks with the NSB 1× 104 BCD Spider. It replaces the stock chainring spider so that you can run smaller rings on XX1, X01, X1, X0, X9, S2210, GX, and S1400 cranks.
They are designed to use any standard 104 BCD 9, 10, 11, or 12-speed chainring. There are no mounting holes for the granny ring, and the position of the single ring has been moved to give a better chainline throughout the entire gear range. The outside tabs accept any standard bash ring for DH or aggressive All Mountain bike applications.
The 104 BCD Boost spiders convert GXP cranks to Boost Compatible Frames.