Sram xx1 11 speed chainset gxp bbdeveloped for maximum chain control each tooths thickness is precisely cnc machined to support the chains inner and outer links perfectly x sync direct mount chainrings let you tune your gear range to match your terrain wheel size and riding style please note bottom bracket is not included featuresarm material carbon arms with forged aluminum spiderweight 645g gxp bb 175mm 32 tooth ringrings cnc machined ringstechnology highlight x synctechnologi