NX 11 Speed GXP Chainset with 32 tooth chainring. The NX 1x 11 speed chain set from SRAM features X -Synch technology that increases performance and durability. The SRAM X-SYNC chain rings use tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. The X-SYNC™ chain rings have been designed with mud-clearing recesses for the inner chain links and rollers. The crank arms are made from aluminum. Compatible with GXP bottom brackets.