Shimano SM-RT70 140mm Center Lock Brake Rotor w/ External Toothing • with externally toothed lockring. • The ingenious Ice-Technology, a sandwich composite of two layers of stainless steel with an inner layer of aluminium. • Mount: Center Lock • Diameter: 140 mm • Rotor Material: stainless steel outer and aluminium core sandwich construction • Spider Material: aluminium • Lockring Material: steel
