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 & durability. The SRAM X-SYNC chain rings use tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp & 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 & rollers. The crank arms are made from aluminum. Compatible with GXP bottom brackets.