You ride every trail like the competition is breathing down your neck. Shimano's XTR Hollowtech II Race Crankset was made just for you. The hollow, cold-forged aluminum crankarms are ultra light, but they're also exceptionally stiff for awesome power transfer and efficiency. Front shifts have never been this fast either, with Shimano's legendary chain rings and computer-designed shift ramps. CloseStep gear combos allow riders to tailor the chainring combos to suit their riding needs.