Sram xx chainring spider coming in at 694 grams bb30 the xx crank delivers amazing performance and durability with no penalties in weight the first mtb crank specifically designed for 2x10 uses some of the worlds most advanced material science the oversized chainrings are cnc machined 7075 aluminium blanks2mm thicker than the competition unparalleled stiffness is delivered by an increased bolt circle diameter bcd and a two piece insert moulded carbon composite construction the xx cra