Delivering amazing performance & durability, the Sram XX is the ultimate 10 speed chainset. Specifically designed for 2x 10 the Sram XX 10 Speed Chainset has been designed using the worlds most advanced material science. Oversized chainrings have been CNC machined from 7075 aluminium which when combined with an increased BCD & the two-piece insert-moulded carbon crankarm the Sram XX offers impressive stiffness & power transfer to create a highly responsive riding feel. BB30 In addition to offering serious weight savings, the Sram XX BB30 10 Speed Chainset also provides a narrow Q-Factor, more ankle clearance, greater bearing durability & a stronger crank to offer the ultimate performance.