Sram x1 1400 11 speed crankset bb30 bb quality and durability combine in the sram x1 crankset to deliver consistent performance every time out featuring srams x sync tooth profile the x1 crankset is engineered for complete chain control each tooths thickness is cnc machined to work seamlessly with the chains inner and outer links features x sync tooth profile provides maximum chain control arm material hollow forged 6000 series aluminumforged aluminum spider chainring material cnc